It's similar to the logic women use when they say, 'Just because he wants sex with you doesn't mean he desires you.' I don't disagree; that's not wrong. But the opposite is also true for men. So many women enter relationships for comfort and stability, and they don't actually desire their partner compared to other men they've been with casually. For men, the faster a woman sleeps with you, the more she desires you and the more desirable you are, most of the time. For women, it makes sense that a man wanting a relationship means he desires you more. That's why I think the ability to have casual sex is the ultimate proof of being desirable. Otherwise, you have to find a woman who has never had casual sex, or have the relationship start with a hookup, to truly know she desired you.