Interesting social debate

[Maddolis]

There are a few reasons why.
Firstly, religion. I'm certainly generalizing here, but plenty of very attractive people have everything handed to them early on and don't have the need to develop intelligence, so they're more prone to buy into the stupid "remain celibate/no sex before marriage" idea.
Secondly, don't know... social anxiety? If a 9/10 or 10/10 of either gender wants sex, they'll get it.