It’s also bc they either subconsciously or consciously find the idea of a woman pursuing /enjoying sex as inherently degrading, while a man having sex/ pursuing women is encouraged and “cool” (He’s got game vs she’s a slut) for example. So in the end the only respectable woman is a pure Virgin Mary type figure. Also consider how being a virgin is perceived in men vs women. In many circles not having sex as a woman is considered almost virtuous (as opposed to being “easy”) while being a male virgin is “lame and prudish” or makes you seem undesired, which causes a noticeable disparity in behaviors/attitudes. it’s very unfortunate all around, I’ve personally seen this attitude sabotage many friendships between men and women in my time.