Unlike aliens, who just want to learn about your human sexuality, and mechas, who just need your sex energy, mad scientists are sometimes a bit more sinister. They often want to hack your body in various ways, nice and otherwise. They sometimes have weird pharmacological supplements that they want to try out on you. Sometimes they're intent on disproving the theory of Intelligent Design by mega-evolving you into a crazy sex beast. You just have to roll with it. Like this sequence from the uber-weird hentai video Cambrian, where a crazay scientist has been experimenting with evolving and devolving both men and women. The transformations into snake-tongued, spikey creatures always seem to happen during sex. (Funny how that is.) One guy is a little taken aback to find himself in bed with a she-monster all of a sudden: Meanwhile, here's a sequence from the hentai video Bondage Queen Kate, which fits into "mad science" more than it did into any other category. Kate is flying across the galaxy on a secret mission (which involves bondage, as you might guess), but her in-flight entertainment gets hacked and starts showing hypnotic sexy images: And then there's the dystopian future of Angel Core. Young women are turned into super-fighters and become part of a giant-robot-powered human empire that looks vaguely Nazi-ish. The only drawback: in order to activate their superpowers, these women have to have sex. A lot. No, more than that. A lot. It's like a commentary on the way sexuality is sublimated to fuel imperialism. Or something: