It’s something of a feminist truism, that rape is mostly/all about power, not sex.
I don’t find that a satisfactory description.
Testosterone in men increases both aggression and the sex drive, and I’m coming around to the idea that there are biological reasons for this. If you look to the animal kingdom, males become more aggressive and more sexually charged during tupping seasons, because they need to ‘fight for’ a mate. Apparently in humans, male boxers can get erections when they are about to have a fight. Also, men who take anabolic steroids are more likely to become stranger rapists - opportunists who just do it because they can.
Many years ago, a friend of mine who had been taking steroids and getting into weightlifting, said to me that he felt so high in the nightclub we’d been in, he felt so amazing, so powerful, he felt like he could have murdered everyone in there, torn them limb from limb, with his bear hands. 🫤 I could not relate at all. So yes, high testosterone makes men feel both powerful and sexually charged.
I think, with men, there is a sexual component to almost every thing they do, so if they are mentally ill, it’s likely that they’ll be doing weird sexual things, much more so than women. I think the urge to dominate others is a sexual urge in men. It’s almost hardwired that dominance = entitlement to sex. And that makes women think WTF?
So with sex crimes from voyeurism, flashing, groping through to rape, I think the sexual urge is central, but that is bound up with feeling powerful and in control. The fact that women feel so powerless when men assault them is obviously the thing that sticks with us and is important to us as the victims, but I think this is not in minds of the the men who perpetrate. They just want to get excited and get off.