I think it means that their body has realized that it can't get any real food and can't possibly supply food for kids as well as themselves so it shuts off their sex drive.
I think how we enjoy or dislike smell is important. Before I tried RAF, some smells bothered me, such as: some men, some sweat, some other body fluids. Then there were body smells I liked, but it was a lightish "like". Since eating RAF I have noticed a change in these things. The reported smells I disliked, I began to finally tolerate. The smells I lightly liked, I instead them enjoy smelling more than before, if I am recording right. That's all.
Wait, ok, I have more, since you're talking about fruitarianism, although I think I never had sex while fruitarian, or at least never started out wanting having it. Maybe that's why cults can use it. Eating raw vegan diet I could tolerate smells well too, but but did not enjoy smells the same way. I think this is important to sex. Also, I have more drive on the RAF, a pure healthy drive is what it feels like. Where on the raw vegan it the drive was kind of a lost drive, if that makes sense, like a tentative one, like nervous and a little uncomfortable that nothing can really calm instead of sure and deep.
Eating cooked food can be like being in a blinding smog or fog, whichever. I guess it can be used to help people multiply, as long as their fertile, or just have more sex if they want sex that way. I didn't feel good and attractive on cooked.