Because men are socialized from a creepily young age to consider sex as something they are owed (along with so many other birthrights that society seems to think unfold from having a dick), while women are socialized from a creepily young age to not think much about sex (at best) or view it as something they owe to men (at worst).
That's just how patriarchy works.
Um, where did you get this trashy info from? I for sure have never been told to not think about sex growing up.
You don't remember your first grade teacher screaming at you to never think about sex? You must have repressed it, it's a core part of the curriculum.
