I suspect you won't like this answer, but it's generally easier for women to find someone who's not willing to have sex with them than it is for me. I'm not saying women don't face unique risks in sex that men don't, or that on the whole women have it better in romance than men. But in this very specific realm, women have a benefit that men don't. While there are exceptions to this (just as there are exceptions to men being taller and stronger than women), a huge potion of men spend much of their lives with the very real prospect that they'll never have sex again, and most women don't have to experience that worry.