Most cases the reason for rape is less about urges, and more about power (with a dash of opportunity). There’s also societal predispositions baked into the way that people are raised. If your parents, friends, neighbours, media, etc, all treat rape as a horrid thing that nobody would do, it doesn’t even pop into people’s heads. And even if someone does it, they get shunned, though in the general the way solarpunk societies are presented also include community support, so both the perpetrator and the victim would get support. For the perpetrator, I’d assume there’d be an involved process of the why - what’s making them feel powerless, or making them think hurting others is okay, or whatever. They might need counselling, rescue from an abusive situation of their own, medication, or whatever not. It’s incredibly rare to have people who genuinely cannot help themselves, in which case they’d need additional support just like anyone else who has troubles that affect themselves and those around them. There’s sadists who are sadistic due to their own trauma, there’s those that are such due to mental health issues, and there’s very few who are like that due to the way they were born. In the last case, it could be a combined “enforced” support, as well as general community perception of “ah, that’s sadistic George, be careful around him and don’t be alone with him, otherwise he bakes a mean cottage pie” kinda stuff, if that makes sense?