There is no such thing as an unvirgin hymen the hymen is broken
during intercourse.
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Males do not have a hymen. Theoretically, you can say that the
male's foreskin is their hymen equivalent, as it serves the same
purpose for the penis as a hymen does for the vagina.
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There are no exercises to break the hymen. The hymen cannot be
broken but can be torn if penetration is rough or forced, simply
exercising is not going to tear the hymen.
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Yes, you can see and feel your hymen. The hymen is tissue that
surrounds the opening to your vagina, thus you can look at your
vulva in a mirror to see your hymen and you can feel your hymen
just by feeling around the opening to the vagina.