Also, you seem to think that if a person has sex, his immediate, conscious goal must be to reproduce and if that's not his goal, he's shallow or immoral or something. They made condoms and birth control for a reason. I can't pull any study or statistic out of my ass and it's not as if I'd know from experience, but I'd say most people have sex because it's fun. If anyone bugs you about being a virgin, instead of saying you're not interested in sex (which will make you sound like you secretly are but have no luck), say you're asexual. That's a valid, permanent reason.
Actually, some asexuals can want sex, either to please their partner or just from the physical feeling. Being asexual has nothing to do with your libido, and you can be both asexual and a libidoist (As I am). However, the difference is that the libido isn't targeted at anyone. It's just kind of there going "Mmmmwrrrr DO SOMETHING WITH ME" and it can be really annoying, actually.