Yes, the general idea of a virgin, or a girl/woman who still has her skin (hymen) is quite sexist and heterosexist. Given the definition of someone who has never had *any* sexual experience being a virgin, I've taken the virginity of several people. After I've taken the virginity of an uncircumcised man, and I always maintain a relationship of whatever sort with themafterward, I "tease" them that they're obviously still a virgin, because they've "still got their skin", and offer to try again to take their virginity. We have a good laugh over this, and often give it as much of a "try" as we can then.

Or, OTOH, when I'm about to take a circumcised man's virginity, and I see he doesn't have his skin, I tease him that he's obviously *not* a virgin, that I don't believe him, because he doesn't have his skin. We get a good laugh out of that one too.