>it's NEVER too late for her to get into a long-lasting relationship so long as she is fertile, and she knows this.

You say it yourself, women become less attractive to males much faster than the opposite. For men, becoming older is not so much of a problem, it can even be a plus. For women, it's much more problematic.

So perhaps young females have less problems finding a partner than males, but this changes rather quickly with time. I think the deal is sweeter for men.

Also, I definitely don't believe that the "virgin" stigma only affects men, there are plenty of women terrified of admitting they never had sex.