Virgins!

Even though I am a virgin, sex is a form of high-level intimacy and most who have sex, do it because they really love/like his or her partner. Since you're performing on a high-level of intimacy there's more of a chance of a bigger heartbreak. I have HAD 2 heartbreaks in my life, both with people I thought it was "going to last forever." I think I would've been more heartbroken if I had had sex with them. High-level intimacy = High-level heartbreak. Also, sex is a major responsibility and you have (or should be) to be a very mature person to have sex. Sex can lead to big things. Condoms can break (and have been known to) and birth control has been known to NOT work.