Christianity doesn't condemn sex, but rather sexual immorality. And there are holy wars about what "sexual immorality" means.
Some people I know think even kissing is a sin. Yet others believe that taken in a modern context, the restriction means nothing and they can sleep with whoever they wish.
If you declare yourself a born-again virgin, then whatver. I still say you lost your virginity.
I will say that I believe that from a Biblical perspective, sex = marrage. (Gen 2:24, Gen 24:67, I Cor 7:4) Which is the reason why I'm still a virgin. So Biblically, premarital sex is a oxymoron.
I've talked too much now so I'll shut up now.