This thread is obviously expanding into a much wider debate ... .. just to zero in on your (op) experiences and observation of these two situations;
If you've been cheated on etc - naturally you might judge that sex by those actions; but plenty of men have been cheated on by women so they might equally try to judge our sex on those actions. Would either be correct. The official stats for cheating - though it's very hard to tell when it's self reporting ; are not far off each other in terms of cheating (for men and women).
I know quite a lot of men who've been cheated on in pretty shit circumstances... My uncle was married to a woman who was an alcoholic and regularly cheated on him. He's now married to a woman who declared feelings for him, having met him while bringing her husband's lunch into their workplace. She claimed the marriage was dead, left her dh and divorce him. Nonetheless it was her coming onto his work colleague while bringing his lunch into work, and him who was left for someone else.
My sister cheated on her long-term on off boyfriend, who she was engaged to at the time and living with. She got pregnant by one of two other men (still don't know which). My other sister is said to have cheated on her ex husband, I believe he forgave the affair and agreed to accept paternity for a pregnancy around the time of the affair; her younger DD bears absolutely no resemblance to him. None whatsoever.
I went to uni with a girl who regularly cheated in her bf with his mate. I travelled with a girl who says straight she'd been cheating on her bf with his friend for most of their relationship
I know a neighbour's DD who cheated on her dh on a girl's holiday ...he forgave and is still with her.
I could keep listing examples.
Fact is the world is full of shitty cheaters of both sexes.
The rest of the behaviour around sexual abuse, assault, rape, exploitation, prostitution, violence,toxic masculinity etc is, of course, a related but separate subject.