My 25mm Prentif turned inside out to show the cavity rim that grips the cervix
Rubber-Masters and the Prentif cap: I have received several enquiries already from Rubber Masters interested in introducing the Prentif into a submissives heavy latex encasement wardrobe. I have to say that is a diabolical idea to use a woman’s contraception and over pressure protection as bondage device to put her further under her master’s control. While use of the Prentif was very popular among sophisticated European women in the mid 20th centaury as a convenient and effective method of birth control it was rarely used as a method of subjugation. These days with the rediscovery of the Prentif by the latex fetish community, encasement of a woman’s cervix in heavy rubber seems to be a turn on not only for birth control device fetishists but for heavy rubber encasement fetishists as well. The soft thick rubber of the Prentif and the grip of the vacuum in both the rim and dome of the cap on such a feminine part of a submissive make Prentif particularly well suited for use in total heavy rubber encasement of beautiful woman of child bearing age. For women not used to wearing a Prentif the grip of the rim and the vacuum in the dome can cause some cramping which Rubber Masters seem to like. I think it is a psychological thing for a heavy rubber encasement fetish guy because he can’t really see his slaves heavy rubber encased cervix w/o using a speculum, but he can feel it with his fingers if she pushes her cervix down.
Fitting, insertion and care of a Prentif: There are four sizes, based on the inside diameter, of Prentif caps: 22 mm, 25 mm, 28 mm, and 31 mm. To ensure a proper fit the cervix should be closely inspected by the woman’s fitter to determine that the cervix is smooth and symmetrical so as not to interfere with the cavity in the rim sealing against the wall all the way around the cervix. It is important to insert a cavity rim cap, either Prentif or Oves, before becoming aroused. After a woman becomes aroused it may be impossible to insert it correctly because the vagina lengthens (tents) during arousal and the pelvis engorges with blood making correct placement and suction on the cervix very difficult to obtain. Before inserting a cervical cap the woman should wash her hands and have short nails or wear latex exam gloves so she doesn’t scratch herself. Then compress the rim and while spreading her labia with the fingers of one hand push the compressed rim into the vagina. Once behind the pubic bone push it up and over the cervix. This can take a bit of getting used to while determining the best angle to use and care must be taken because if turned the cap can suction onto the wall of the vagina rather than on the base of the cervix. Once the cap is in place and the dome dimples the wearer should sweep a finger all the way around the dome to check that the cap is correctly covering the cervix.
To test for a good seal the woman should insert the cap, wait 15 minutes, remove the cap and then immediately feel for the raised rim tissue – that was pulled into the rim cavity - to ensure that there is raised tissue the full 360 degrees around the cervix. If there is raised tissue all the way around the cervix after 15 minutes of wear that means the cap is a good fit and it is sealing well. Also on all but the 22 mm size, the top of the dome will dimple from the vacuum in the dome if the cap is a good fit. A 22 mm will not dimple because the dome is too small and stiff.
To clean a Prentif it should be turned inside out and the cavity cleaned carefully with a toothbrush and warm mild oil free soap and water to ensure it is free of mucus, rinsed well and then let air dry. A Prentif should not be exposed to cold weather as the latex will harden and shatter and of course oils will cause the natural rubber to deteriorate rapidly so only water based lubes should be used with a Prentif. To visually inspect for latex aging; the first sign is that the latex will become stiffer, gives less and the domes of the larger caps will remain dimpled after the vacuum is released. Then look for cracking around the dome to rim interface while the Prentif is turned inside out for cleaning. This will reveal any latex aging. The effective life of a Prentif will depend on the user (use frequency and vaginal environment) and can be as short as 2 years and as long as 10 years. I take good care of my 25 mm Prentif and though it is no longer my primary method I use it occasionally for play. It is 7 years old and still develops a wicked vacuum so I have to pry it off my cervix and shows no sign of latex fatigue. A Prentif cap can be worn safely for at least 48 hours then removed, cleaned and immediately reinserted. If spermicide is used the dome should be no more than a third full, more could cause the spermicide to be forced into the rim cavity and break the suction. And as I’ve mentioned women with excellent fitting Prentif caps can safely wear them dry.
Rubber-Masters and the Prentif cap: I have received several enquiries already from Rubber Masters interested in introducing the Prentif into a submissives heavy latex encasement wardrobe. I have to say that is a diabolical idea to use a woman’s contraception and over pressure protection as bondage device to put her further under her master’s control. While use of the Prentif was very popular among sophisticated European women in the mid 20th centaury as a convenient and effective method of birth control it was rarely used as a method of subjugation. These days with the rediscovery of the Prentif by the latex fetish community, encasement of a woman’s cervix in heavy rubber seems to be a turn on not only for birth control device fetishists but for heavy rubber encasement fetishists as well. The soft thick rubber of the Prentif and the grip of the vacuum in both the rim and dome of the cap on such a feminine part of a submissive make Prentif particularly well suited for use in total heavy rubber encasement of beautiful woman of child bearing age. For women not used to wearing a Prentif the grip of the rim and the vacuum in the dome can cause some cramping which Rubber Masters seem to like. I think it is a psychological thing for a heavy rubber encasement fetish guy because he can’t really see his slaves heavy rubber encased cervix w/o using a speculum, but he can feel it with his fingers if she pushes her cervix down.
Fitting, insertion and care of a Prentif: There are four sizes, based on the inside diameter, of Prentif caps: 22 mm, 25 mm, 28 mm, and 31 mm. To ensure a proper fit the cervix should be closely inspected by the woman’s fitter to determine that the cervix is smooth and symmetrical so as not to interfere with the cavity in the rim sealing against the wall all the way around the cervix. It is important to insert a cavity rim cap, either Prentif or Oves, before becoming aroused. After a woman becomes aroused it may be impossible to insert it correctly because the vagina lengthens (tents) during arousal and the pelvis engorges with blood making correct placement and suction on the cervix very difficult to obtain. Before inserting a cervical cap the woman should wash her hands and have short nails or wear latex exam gloves so she doesn’t scratch herself. Then compress the rim and while spreading her labia with the fingers of one hand push the compressed rim into the vagina. Once behind the pubic bone push it up and over the cervix. This can take a bit of getting used to while determining the best angle to use and care must be taken because if turned the cap can suction onto the wall of the vagina rather than on the base of the cervix. Once the cap is in place and the dome dimples the wearer should sweep a finger all the way around the dome to check that the cap is correctly covering the cervix.
To test for a good seal the woman should insert the cap, wait 15 minutes, remove the cap and then immediately feel for the raised rim tissue – that was pulled into the rim cavity - to ensure that there is raised tissue the full 360 degrees around the cervix. If there is raised tissue all the way around the cervix after 15 minutes of wear that means the cap is a good fit and it is sealing well. Also on all but the 22 mm size, the top of the dome will dimple from the vacuum in the dome if the cap is a good fit. A 22 mm will not dimple because the dome is too small and stiff.
To clean a Prentif it should be turned inside out and the cavity cleaned carefully with a toothbrush and warm mild oil free soap and water to ensure it is free of mucus, rinsed well and then let air dry. A Prentif should not be exposed to cold weather as the latex will harden and shatter and of course oils will cause the natural rubber to deteriorate rapidly so only water based lubes should be used with a Prentif. To visually inspect for latex aging; the first sign is that the latex will become stiffer, gives less and the domes of the larger caps will remain dimpled after the vacuum is released. Then look for cracking around the dome to rim interface while the Prentif is turned inside out for cleaning. This will reveal any latex aging. The effective life of a Prentif will depend on the user (use frequency and vaginal environment) and can be as short as 2 years and as long as 10 years. I take good care of my 25 mm Prentif and though it is no longer my primary method I use it occasionally for play. It is 7 years old and still develops a wicked vacuum so I have to pry it off my cervix and shows no sign of latex fatigue. A Prentif cap can be worn safely for at least 48 hours then removed, cleaned and immediately reinserted. If spermicide is used the dome should be no more than a third full, more could cause the spermicide to be forced into the rim cavity and break the suction. And as I’ve mentioned women with excellent fitting Prentif caps can safely wear them dry.
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