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Sera,
The menstrual cups that are reuseable and last a long time are more rigid and sturdier and deeper. They fit a bit lower in the vagina and are designed to have a more leak-proof fit.
It is possible to have sex with a disposable menstrual cup (in fact, their marketing literature points this out) because they are so similar to a cervical cap - only a bit deeper but at least as flexible. The reuseable cannot be left in with penetration.
I have know others who used the cervical cap that way. I guess you get double use. But, they are more likely to leak because they do not have the seal against the vaginal walls.
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Brandye
Don't wear cheap bras!
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