I mean, when I was a young man (to be honest as young as 12) I had sexual "fun" with girls in my class (after school, not during!). And I had hetero sex pretty early. I didn't come out as gay until my mid-20s. But I've noticed that with women, often they seemed a little less clean "down there" than men. I think it's just because females have parts down there that get mucky...(don't mean to gross anyone out).
I know people assume men must be gross down there, but most guys I've been with are not at all. In fact, not even in the slightest. Maybe I lucked out with really clean guys - but I prefer their body cleanliness environment (?) to that of women. I hope that doesn't seem sexist, but it probably is.