The image above shows the cervix and the opening (the os) in its center that leads to the uterus, on day 7 of a menstrual cycle shortly before the woman becomes fertile. The camera is looking at the cervix as a doctor would while the woman is on an exam table with a speculum inserted to hold her vagina open. The cervix is the conical protrusion from the back end of front wall of the vagina. The back side of the rim of a diaphragm fits into the posterior fornix (the area behind the cervix) which is the dark area under the cervix in this pic. The front rim of the diaphragm tucks into her pubic notch just above her pubic bone. The bladder is above the vagina’s anterior wall (at the top pf the pic) and the colon is behind the vagina’s posterior wall (at the bottom of this pic) In cervical barrier contraception a diaphragm or cervical cap with spermicide in the dome covers the cervix to prevent sperm from passing through the opening in the cervix and reaching the woman’s fallopian tubes where, when she is fertile, it can remain motile and potent for 7+ days waiting for the woman to release an egg.
A selection of contraceptive diaphragms and cervical caps
Cervical barriers: The above image shows a selection of contraceptive cervical barriers used to protect a woman’s cervix during sexual intercourse. The cervix fits under the dome of the barrier which seals against the wall of the vagina or directly against the cervix. The eight barriers shown in the image are, from left to right:
Top row: The Ortho All-Flex, an arching-spring diaphragm and the Cooper/Surgical (Milex) silicone wide seal diaphragm.
Second row: Prentif cavity rim cervical cap and the FemCap
Third row: Lea’s Shield and an Ortho coil spring rim diaphragm
Bottom row: A Semina silicone diaphragm made in Brazil and an Oves cavity rim cervical cap.
Discontinued or otherwise unavailable barriers: The Prentif cap and Lea’s Shield are no longer generally available and Semina and Oves are only available in the U.S. in clinical trials.
Cervical barriers: The above image shows a selection of contraceptive cervical barriers used to protect a woman’s cervix during sexual intercourse. The cervix fits under the dome of the barrier which seals against the wall of the vagina or directly against the cervix. The eight barriers shown in the image are, from left to right:
Top row: The Ortho All-Flex, an arching-spring diaphragm and the Cooper/Surgical (Milex) silicone wide seal diaphragm.
Second row: Prentif cavity rim cervical cap and the FemCap
Third row: Lea’s Shield and an Ortho coil spring rim diaphragm
Bottom row: A Semina silicone diaphragm made in Brazil and an Oves cavity rim cervical cap.
Discontinued or otherwise unavailable barriers: The Prentif cap and Lea’s Shield are no longer generally available and Semina and Oves are only available in the U.S. in clinical trials.
A complete FemCap with the removal strap still attached
FemCap: FemCap is the best barrier for protection during dive-sex because it can be used at any depth and is the only barrier that provides meaningful thrust buffering. In the image above the wider brim, shown on the left, is worn against the back wall of the vagina. The removal strap is often trimmed off which gives the wearer and her partner a bit more room when the male is big relative to his partner’s vagina. The outer walls of the brim seal against the walls of the vagina and the dome covers the wearer’s cervix.
An All-Flex diaphragm compressed for insertion
All-Flex diaphragm: All-Flex is the Ortho-McNeil version of the arching spring rim diaphragm and the type most often prescribed by experienced barrier fitters. That’s because it has a stiffer spring that can be worn by women with poor vaginal muscle tone and because since it folds in two planes (see the image above) into a crescent it is easier to get the back rim of a compressed All-Flex behind the wearer’s cervix. The All-Flex reduces the number of times women insert their diaphragms improperly and are therefore unprotected.
Birth control at St Lucy’s: I have started my Contemporary Sexual Health class for students who will be entering the school for the Summer term. CSH is a mandatory course given the temptations available in the surrounding area. Though compulsory almost all the students are very interested in learning how to protect themselves during recreational sex.
St Lucy’s policy on the use of contraceptives is where possible to minimize the use of hormonal contraception. For some few women hormones are necessary to regularize their cycles or control heavy bleeding, but St Lucy’s believes in teaching discipline and learning to use a cervical barrier correctly does teach discipline. Used correctly a properly fitted diaphragm or cap is (at St Lucy’s) actually better than the pill for teens because a large percentage of teens don’t take their pills correctly. The student’s barriers come with RFID chips so we can track who is wearing their protection and who isn’t and the ones who aren’t get penalty points which bring them in line quickly. And, of course a diaphragm can be used to minimize the mess during menstrual sex. Both diaphragms and caps can be used to protect against over-pressure events during dive-sex but a diaphragm is effective only to a depth of 10m when the rim starts to distort due to the pressure.. A strapless FemCap is better than a diaphragm for dive protection because there is no limit to the depth at which it can be used and it also provides thrust buffering if the woman’s pelvic anatomy is small in relation to her partner.