[MWF]

There are two definitions of sex, the first one refers to sexual intercourse, the other refers to the biology of the person, usually male or female. Whatever, its a nuance.
Anyway, virginity isn't always as simple and straightforward as it sounds. It is what you make of it. Like is sexual activity of any kind considered losing your virginity? Is one second of vaginal penetration considered losing your virginity for men or women? I wouldn't really consider it that, even though society basically says vaginal intercourse is standard. What about blowjobs? To some people, thats sex (believe it or not), but not to others. To me, virginity is just a word. For example, I did anal with my friend when I was 16, but I still consider myself a virgin because I haven't had sex with a woman. But I still consider anal as sex in other contexts, maybe because I assume the people involved enjoyed it (I didn't, my friend was a terrible person who didn't use lube).
So... virginity is something that you would brag to your friends about losing? Hell, now I don't even know. Or maybe virginity is just an identity that people take on so they can celebrate losing it while getting a milestone.