I seem to vaguely remember having the opinion "Don't know what I'm missing" before I had sex, too. But I wasn't fooling anyone, even myself. I still wanted it. It becomes even more tempting when you're in a relationship with somebody. We can grandstand about how distanced we are from our sexualities all we like, but our societal makeup indicates that 80% of young, male forumites on the internet aren't staying chaste because it goes against their morals and values, so much as they just don't have a girlfriend. There probably are a few youngsters who are avoiding sex for religious reasons, or for sex and love reasons (I was that way before I had sex, and then I lol'd and realized that was sort of silly. Most people don't stay with the first person they sleep with. Am I going to grandstand it over my wife if I only had sex with her and she was like everybody else and had three or four partners beforehand? Anyone who does better be prepared to have sex with a second person they fall madly in love with and marry). Lots of you are actually still in high school, though, so you can probably say better than I can how eager your friends, even the ones you like (for the angsty among you who always complain everybody in your school is stupid), are for sexual activity of any sort.
Most people who claim to be asexual on the internet usually aren't, either.