Under-thrusting diaphragms

A latex All-Flex arcing spring diaphragm was best for under-thrusting

Under-thrusting play: On another forum there was a recent discussion of a method of under-thrusting that involves using a diaphragm that is a size too large. I suppose in some limited circumstances that might be possible. However, for the maximum comfort of both parties I think for under-thrusting play a diaphragm at least one size (5mm) smaller than the size a woman needs for contraception should be used. The Ideal style diaphragm for under-thrusting play was the latex Ortho All-Flex arcing spring. However, Ortho switched from latex to silicone for its All-Flex in the fall of 2008 and stopped making the coil spring rim style entirely so the few of us who still have a latex All-Flex in good condition are fortunate indeed. The 70mm latex All-Flex shown in the photo accompanying this post is two sizes too small for me and is the size I use for under-thrust play. As I’ve mentioned before a latex dome is stretchier and has much better heat transfer properties so it’s much more fun to use than the newer silicone All-Flex. And for those fond of the rubbery/fishy scent of a diaphragm that has marinated in vaginal and cervical fluids during a lengthy insertion (more than 24 hours) a latex dome has a much stronger odor than does silicone. The scent of old semen discharge adds to the stench which some vaginal fetishists find intoxicating.

An under-thrust study: A few years ago I participated in an under-thrusting study while wearing correctly sized [rather than a size or two smaller] and properly positioned diaphragms of all the available rim styles – Arcing, coil and flat spring with both uncut partners of very large girth and more normally equipped men. With the latex All-Flex (the easiest rim style to under-thrust) for the large girth men it was uncomfortable for both of us. Those encounters were part of a study my women’s clinic conducted to see which rim style put the wearer at the greatest risk of having her diaphragm accidentally under-thrust while using it for contraception during vanilla sex. All the women participating in the trial had deep post-pubic vaults as most women do. women with shallow or no post-pubic vaults aren’t good candidates for effective diaphragm use because the anterior rim is positioned where it may hurt a partner during vanilla sex and is easier to under-thrust than if the woman had a pronounced/deep post-pubic vault.

The results of the study showed that the easiest to under-thrust was All-Flex (arcing), then Milex Omniflex (coil) and Semina (coil) of similar ease. Then Milex Arcing and the most difficult was Reflexions flat spring. The Milex Arcing is more difficult than the All-Flex because it folds with two elbow hinges so the rim has to be positioned exactly right for a thrusting penis to cause it to fold. The switch from latex to silicone has not changed the study results. Of course no diaphragm is risk free since acute angle brute force thrusting can stretch the vaginal wall to allow a penis under the rim even of a Reflexions flat spring.

Penetration depth: In missionary penetration depth can depend on the shape of the couple’s pubic bones making standard missionary unlikely to attain deep thrusting unless the male partner is very well endowed. During the trial when I was taken in missionary all of my uncut partners of very large girth came away from their encounters with sore or sometimes raw frenulums. One was in so much pain he lost focus and couldn’t finish. With one or both partners having prominent pubic bones it may be necessary for the woman to put her legs on her partner’s shoulders to give him the depth to reach her cervix and the thrust angle needed for under-thrusting. I have a prominent mons veneris and at that angle I had to use lubricating gel on my labia to prevent perineal tears that less experienced women in the trial were having. It was a tiring and not all that pleasant experience.

Doggie style was somewhat better - wasn't nearly as traumatic for the men, but for me having the rim forced into my posterior fornix when he’s trying to get under it was still uncomfortable. While still tight there was more room between the back of my pubic bone and the rim (because on my elbows and knees my uterus and cervix are pulled deeper into me by gravity) for him to get the smooth top of his glans under it. And of course because of the gravity effect I could take a longer man more comfortably. Doggie is certainly the preferred position with a well endowed partner because his frenulum caresses my G-spot while his tip thrusts into my cervix.

Again the above results were for large girth men with the woman wearing a correctly sized diaphragm. For a man of more normal size the order of ease to under-thrust didn’t change, but the men suffered less physical damage. With a too small diaphragm you get all the pleasures of under-thrusting while lessening the discomfort and possibility of damage to your male partner(s). The only down-side of using a too small D is that for some women it may be difficult to remove afterward.

Fisting diaphragms

A compressed flat spring diaphragm showing the folds in the latex dome

High-vac diaphragm play: Returning readers will remember that I’ve written about the advantages of wearing a flat spring latex diaphragm (better heat transfer characteristics and it’s nearly impossible to under-thrust) for dive-sex and about the amazing feeling that I’ll call ‘cervical grip’ when wearing it with the dome under significant vacuum while diving or in a hyperbaric chamber under positive pressure. You can get a somewhat similar effect with a silicone (Ortho or Milex) diaphragm, but because a silicone dome is thicker and less elastic the amount of stretch to be had with a latex dome is far superior and the voids left unfilled by a silicone dome can cause painful squeeze.

In my experience as a cervical barrier fitter less than half the women correctly fitted with diaphragms have the vaginal wall structure that will allow developing and retaining a very strong vacuum in the dome. Diaphragms for the rest will work perfectly well for vanilla sex when spermicide is used in the dome, but their rugae – the transverse ridges that allow the vagina to stretch during childbirth - will not allow the rim to seal tight enough to sustain a high vacuum. A woman having a pronounced post-pubic vault and soft thick rugae is an ideal candidate to wear a latex diaphragm and achieve a high vacuum in the dome to enjoy its cervical grip even without penetrative sex. I thought high-vacuum diaphragms would be of primary interest to the young rich Europeans at The Lorelei, but it turns out that a few menopausal guests, whose rugae are atrophied, find their diaphragms often seal very well, and love them as much as reproductive age women. The older ones seem to like the clandestine masturbatory aspects of wearing a ‘fisting’ diaphragm (more about them below) w/o the mess of being mounted by a man regardless of how magnificent his body. With the availability of multi-bed hyperbaric chambers small groups of friends in this amazingly erotic fetish can all insert and establish the vacuum in their diaphragms before they go hunting men or just clubbing.

High-vac ‘Fisting’: It’s not nearly the experience of having a partner’s fist in your vagina, but still there is a lot to enjoy. With a strong vacuum in a latex dome the membrane will be stretched down over the cervix filling all the voids in both posterior and anterior fornix. In a properly fitted diaphragm the rim never fully opens because it is gripped by the muscles in the vaginal walls and the flat spring rim will not fold at a right angle to the plane of the rim so it provides a stable base to take the strain of the stretched latex w/o deforming. The folds (shown in the photo accompanying this entry) will be stretched out to fill the anterior fornix and flatten the rugae on the anterior wall causing the dome to be stretched upward putting pressure on the bladder as though the woman is being fisted by her diaphragm. So empting the bladder prior to inserting a diaphragm for high-vac play is very important. Under vacuum the dome also puts pressure on the woman’s G-spot causing some of us to become aroused and far more easily taken to orgasm by inserted fingers, vibrator or a thrusting penis. The problem with using a latex diaphragm for high-vacuum applications is that the dome failure rate is quite high for diaphragms in use for more than six months.

Latex fatigue dome failures: In high-vac dome-fisting applications the domes of properly cared for latex diaphragms will rarely tear, but will develop a thin spot or spots which will fail during use and in some cases no thin spots can be seen when checked just prior to failure. What we recommend for escorts and individual clients using latex diaphragms for high-vac applications is that regardless of how structurally sound a latex diaphragm appears to be during a stretch test no latex diaphragm should be used for high-vac play for longer than six months.

Women who enjoy high-vac diaphragm play usually use another method for contraception, typically hormonal; the pill, patch or shot, but some few have IUDs inserted or are menopausal. Since a silicone gel is used in the dome to reduce the likelihood of rugae squeeze the lube also reduces the possibility of the IUD strings sticking to the diaphragm and being pulled out when the diaphragm is removed. I of course wear an Oves cap under my fisting diaphragm. With a flat spring under high-vac I can compress the rim with my muscles and caress my G-spot in a solo orgasm so intense it’s addictive.

Establishing dome vacuum: This discussion assumes the woman has been tested and found to have the necessary pelvic anatomy to retain a significant dome vacuum at ambient atmospheric pressure. The woman should be on another effective method of contraception if a sexual encounter is anticipated in case there is a dome failure. She should also take a decongestant an hour ahead of her chamber appointment if she is prone to ear and sinus pressure equalization problems when diving or cycling in a hyperbaric chamber.

The flat spring latex diaphragm is checked for obvious signs of latex fatigue. If none are found silicone gel (we use DiveGel+ which includes a spermicide) is applied in the dome to lubricate the cervix and prevent rugae squeeze, then the diaphragm is inserted and checked to ensure the cervix is under the dome. Then the client goes into the chamber with an attendant and the pressure is increased by the desired amount

Over time we have found that a pressure of two atmospheres (the equivalent of a dive to approximately 30 feet), which puts a vacuum of about -14 psi in the dome, is sufficient to cause the dome of a Reflexions diaphragm to be sucked into all the voids on the anterior wall and surrounding the cervix. This can take a few minutes depending on how well the client adjusts to the pressure cycle and if the vacuum holds when the chamber is returned to ambient pressure. It’s a weird feeling having the vacuum push on the bladder and grip the cervix and it can take a bit of getting used to even by fisting diaphragm fetishists. Once the client’s diaphragm is under vacuum and she is comfortable she is free to leave the chamber to continue her day.

Exclusivity: High-vac dome play had, until recently, been limited to dive-sex, or a very few airline cabin attendants who could insert their diaphragms while still at altitude, but with the availability of multi-bed hyperbaric chambers at Adolph’s club, Splash, his resort/spa, The Lorelei, and another at his deep dive training facility the ability of guests to walk around during daily spa or shopping activity while enjoying the tight cervical grip of a latex diaphragm is available to those women with the necessary pelvic anatomy and money to afford it. In addition to pelvic anatomy the number of possible high-vac users is limited further because many women can’t stand the continuous pressure, the ‘cervical grip’, of the dome. It just freaks a lot of women out to have continuous pressure on their cervix. So with the small number of women, who are actually aroused by the feel of their cervix gripped by a fisting diaphragm under vacuum as a prelude to sex, the circle of women interested in the fetish is quite small and they often form close and lasting friendships.

Side effects/problems: Of course with latex diaphragms they can’t be used by couples either of whom have or develop a latex allergy, but aside from that: As mentioned earlier the dome under vacuum puts pressure on the bladder and cause the need to urinate frequently so we recommend that women prepping for a high-vac experience avoid diuretics, such as coffee.

We are finding that prolonged continuous use of a latex diaphragm under high-vac can lead to exhaustion, vaginal muscle soreness and the possibility of tears in the rugae if not lubricated with a silicone gel. Another problem can be releasing the vacuum in the dome when the wearer wants to remove her diaphragm. The hard flat spring rim has been pulled tightly against and seemingly buried in the soft tissue of the rugae making the rim very difficult to get a finger under to break the seal and fingernails can easily tear rugae. What works well as a removal aid is a flat handle ice tea spoon. The spoon can be warmed and the tip of the handle lubricated and inserted carefully under the anterior rim just behind the pubic bone. It’s not as difficult as it sounds and it just takes a time or two to develop a removal technique that works for you.

Like wearing negative rise shoes to stretch the achilles tendons after spending hours in pointe-shoes, the use of Ben Wa balls for toning before and after wearing a diaphragm at fisting vacuum is highly recommended as the vacuum can stretch the wearer’s muscles and if not countered with toning exercises may result in reduced vaginal grip.

High-vac and death rubber: I find it especially erotic to wear a latex diaphragm that I’ve harvested from the body of a woman who died while having sex. Returning readers will recall that any rubber apparel or devices I harvest for my own use I call ‘death rubber’. When we found that the life of a frequently used fisting diaphragm was only six months I was concerned that I wouldn’t be able to harvest enough FS latex diaphragms in my size to keep me supplied. However, because there is a high turnover of Towel-Girls at Splash and because many of them are tall show-girls moonlighting there a very high percentage of them wear my size diaphragm for fetish encounters. So far enough of them have run into difficulties – usually during exotic off-prem encounters - that there has been no shortage of death rubber. Fisting diaphragms are a niche market, but since the demand for latex flat spring diaphragms is increasing - from young escorts offering fetish encounters - I think with the usual casualty rate in that line of work I should have a steady supply for my personal needs.

Pointe Shoe Quiz January 22, 2013

Who is the maker of these shoes?

This may or may not be a bit tricky. The fore-sole shape and stitching are distinctive.

Training swimsuits

The REALISE T-020 swimsuit white, high neck, thong back, transparent when wet

Blogger Image posting problem: Apparently those of us who use Internet Explorer have been unable to post an image from our computers to our blogs since about January 2nd. The problem was just fixed late this afternoon, which is why I’m just starting to post now after returning from the UK on the 4th. You’ve got to love the speed at which those Google techies work when they are fixing a problem that affects a competitor’s browser.

I’m back: I had a marvelous time in the UK, at Stonehenge for the Winter Solstice, though I was really sore, from insufficient padding on the altar, after the ceremony. I spent the rest of the time at Cyndi’s Grandfather’s castle in Scotland with Jack, Lord Sandbach, the Dukes son who is interested in me in spite of his father wanting him to wed a younger woman. I thought at first that the old bull was worried about me producing healthy heirs, but from what I overheard him say during this last visit it seems that he looks on me as his ‘fancy piece’, since he was my lover for a while until he had a heart attach while in my saddle. He couldn’t get off so I ripple gripped him and the orgasm he had was too much for his heart and he nearly died! Sigh! His doctor said he wasn’t to take me any more if he valued his health and while he has mostly followed doctor’s orders in that regard he can’t abide John having me whenever he wants.

Training opportunities: Taryn said she had some opportunities we wouldn’t want to miss and suggested that Cyndi and I bring our training gear with us, meaning pointe shoes, tights, leotards, swimsuits and Ben Wa sets. For contraception Cyndi just had her second GyneFix IUD inserted two months ago (it has a three year life) and as usual I’m using an Oves cap and a latex Reflexions flat spring diaphragm. Even though the Druid priests put woven mats of reeds on the stone altar on which I lay for forty minutes while the young male inductee filled me with his seed as I ushered him into the mysteries of the faith, I ended up with my back covered with bruises from the 140 pound man driving my back into the reed mats that the thin exposure suit did not protect against. Fortunately several sessions with Taryn’s masseuse and I felt great although my back was purple and yellow for weeks afterward.

Transparent swimsuits: Does remember the Ujena swimsuits from the 80s that became transparent when wet? Well, things have gotten much better since then. The style shown above by the Japanese firm Realise was available only in white with a high leg and thong back and made of material that is transparent when wet: 82% Polyester, 18% Polyurethane. It’s guaranteed to be a traffic stopper in any pool! It was available for about $85 USD

Training and assessing men: Adolph has gotten the mfg. to make similar suits and a thong-back bikini version of the same material for his Towel-Girls at Splash and a few of his closest women friends including Cyndi and me. I call this style my ‘assessment suit’ because I wear it as a bodysuit while working to assess and train male escorts in the art of foreplay. The snug fit tests the trainee’s ability to innovate to arouse me through the fabric, though with waxed pubes the thong can be easily pushed to one side allowing ready access for direct fingering or penetration. I like this style too for taking technique classes (for PDD I’d wear a different, non transparent, style and tights) as I think it shows off my flat belly and great legs to advantage and the 18% Polyurethane makes the stretch firm enough to provide excellent support for all but fully engorged breasts. Cyndi and I took these suits to workout in so as we sweat in the studio with our trainers more of our bodies are on display even though we remain completely covered, but visibly nude. It was a matter of sexually frustrating our English pointe trainers who worked us very hard while we trained. They have been known to occasionally fall for our tease and get a quick piece if they are lucky. It’s so much fun be able - while appearing to be disinterested - to flaunt our bodies to get men who are totally absorbed in the controlled movement of the female body interested in having sex with us. After the first few classes our teachers suggested sex first after which we could all concentrate fully on our technique.

Rubberized suits: The on-line store is at: http://www.jpnswimming.net/product/750 also have REALISE rubberized suits, of Polyurethane, with a thong back and they are ideal for underwater fighting where an opponent will try to hold on to or pull off your suit as the material does not stretch or snag, but the fit is critical as a Polyurethane suit that is too small will be very uncomfortable and one that is just a bit too large will gap and allow finger holds.

While conducting escort training I wear a black Polyurethane suit – so I’m easily identified as a trainer - while I’m in a training pool with escort candidates since tempers can sometimes get out of hand when the girls are showing off competing for a particular male nearby. The trainees wear pastel colored rubber suits and knowing that men are so near, but unattainable while wearing a Polyurethane suit frustration increases and tempers of highly sexed competitive women easily fray leading to fights I have to stop. Though I can’t wear it for sex I find that a well fitting Polyurethane suit is very comfortable to work in as it provides binding for my breasts holding them snugly in place after I’ve emptied them. Then I’m good for about two hours in the suit until my breasts fill to the point that they become uncomfortable bound against my chest in their unstretchable Polyurethane girdle.

Working during vacation: I did work on a few Valentines Day strip routines in the castles studio that His Grace had built for Cyndi. My audiences at the high roller club venues are predominately white men of a certain age who remember songs from the 50s when they still had melodies, big bands were still common, and vocalists who could actually sing were performing. In our venues performing to songs of that period a girl can increase her tips exponentially, filling her G-string with Hamiltons, Jacksons and an occasional Grant rather than Washingtons and Lincolns. So after class I worked on a few routines to be performed en pointe to songs they will remember:

Al De La - from the 1962 film Rome Adventure staring: Troy Donahue, Angie Dickinson, Rossano Brazzi and Suzanne Pleshette, has a lovely flowing melody that a very languid strip can be performed to.

The Third Man Theme – from the 1949 film - played on the zither. Its pizzicato melody is perfect for stripping, or even kinky sex, en pointe for a performer skilled enough and with stamina enough to stay on her toes that long.

La Vie En Rose - The signature song of French singer Édith Piaf, written in 1945, popularized in 1946, and released as a single in 1947

Fascination – The music has been around since the early 20th century as a waltz. With lyrics in 1932 it was published in 1932 as a song. Jane Morgan’s recording in 1957 became her signature song. Stripping to a waltz can be great fun!

Teach Me Tonight – Published in 1953 popular versions were recorded by Joan Webber and the De Castro sisters in 1954.

It’s good to be home: While I had fun and could relax in John’s arms it’s good that I’m back because while the ballet company ran smoothly there were problems at Splash, and with the attending staff that run the three multi-bed hyperbaric chambers Adolph has; the newest at Splash, one at The Lorelei and the other at his deep dive training facility. Nothing that training and a vacuum aspiration or two can’t fix, but still for the women involved who weren’t careful enough it is a trying time. And of course UNLV starts their Spring term today so I’m sure I’ll be hearing from some of the sorority women.