What has sex gotta do with marriage? It is love and not plain animal manner of copulation. And if i want to lose my virginity "emotionally" nuthing should stop anyone from doing that. I would want to spend my life with one girl only, and if i have had sex with her, that doesnt make either of us less puerile. I have spent 7 long years in one relationship and plan to continue for many many more years to come. And sex has no defining role to play in it.
It is because of the emotional connect. Physical is just an element of intimacy. God forbade, tommorow if i am to separate, then it would NOT BOTHER me at all about the girl i finally marry, is a virgin or not. Coz i will never have that emotional connect as i had. So then where does the matter of sex: post or pre marriage come into picture.