Pop your cherry is slang for the breaking of the hymen. The hymen is about a half-inch inside the vagina and can be broken with penetration or even if you're just very active. Some girls are even born without them. This term is also used to describe losing your virginity.
The concept of female "virginity" has a complicated history, having often been (incorrectly) linked to whether or not a woman's hymen was intact. Bleeding after intercourse was thought to be proof of an unbroken hymen, and thus, proof that a woman had not had sex before. The reality, however, is that the state of your hymen has nothing to do with your sexual activity. As for how to know if your hymen is broken, it's near impossible to see it for yourself. But let's back up and talk about what the hymen actually is.
The hymen is a small, ragged membrane just inside the opening to the vagina . All all hymens are not created equally. So many things other than intercourse can wear the hymen away, including horseback riding, biking, gymnastics, using tampons, fingering, and masturbation. Some women are even born without hymens.
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