Natural selection could explain life-long virginity
I think that natural selection fully explains why some men cannot get laid or cannot get any affection from the opposite sex.
While technically speaking I'm not a virgin (I had sex with many a hookers) I could be considered a virgin in the sense that I have never had sex with anyone who would have loved me or would have felt attraction towards me.
So I think I belong to the minority group I am talking about.
I don't personally know anyone who's in a similar situation like me so there must not be many people like me (percentage-wise) but our numbers can be high numerically speaking.
Reasons can be different. If it's a personal decision then it's probably fine to refrain from forming relationships.
But in my case, it's not a choice. Some people are meant to be losers. It's natural selection.