";losing your virginity is where actual genital contact (idk how else to put it) happens."
Not exactly true. It's a lot more than 'contact', it's skin breaking caused by penetration. I mean, yeah, naughty9490 is explaining someone who hasn't had sex for romantic reasons is still someone who hasn't had sex in the front...I didn't know how else to explain that.
Sid and Nancy is closer to the truth. It's when the hymen is broken for a girl...I'm not sure what it is for a guy. I think it's when he has not had sex yet.