I had a similar experience. Didn't lose my virginity though, she just wanted me to go down on her, and when she had reached her climax, I was kicked out. There's been other times when other girls would talk to me about sex, but when they consider the idea of me having sex with them, suddenly I become the 'Gay Best Friend', just such a good guy who listens to what they say and wouldn't want to ruin what's been built. I can understand that to a point, but when one of these girls has considered the idea at 6 times, I become a little agitated.
The stigmata's of sex are becoming rediculous to me, like a girl can't have sex with someone or else she'll get the label of slut, and guys who sleep with lots of girls are considered awesome, or pigs depending who's side you're gonna take. Best way I can put this is that sex is sex, I'm now 20 and still have yet to lose my virginity, but if I do then that's cool, but I do wish that sex wasn't so shunned upon. Without sex, none of us would be here, we would be gone and erased from any form of history, let alone exsistence. If you're a guy and see a girl or guy (depending on which team you're on) or vise versa, and the other is consenting to sex, just go for it, and enjoy the connection you two will feel, because that's what it's all about.
Sex is something we were given by god, or nature, or a freak accident, what ever you want to believe. It's there, don't let names get in between the great fun and experience it offers and just have fun with each other. Role around in the sheets, under the stars, or in their kinky sex dungeon, just shut the fuck up about god and politics and get lost for an hour or so.