Really, you just compared young sex to being homosexual? I'm offended.
Kids should not be having sex. More than half the time they regret their first time because they just wanted to "get it over with" to "be cool" and "be more mature." They don't take the time to actually think through if they are mentally ready. They don't think through if the person they have sex with is the right person. Don't misunderstand me, being the right person doesn't negate being the person you wind up marrying, but rather someone that isn't going to just use you, or hurt you, then you wind up regretting it.
Me, I waited until I was 18. Mentally, I was ready at 16, but I wanted to find the right person. I am the only one out of my friends that doesn't regret who I lost my virginity to.