Didn't her vampires come with permanent erections? They couldn't/didn't use them, but they were always at least semi-erect, if I recall correctly. And actually now that I think about it, one of her vampire couples did have sex while sleeping in their coffin together. But it wasn't really sex, because her vampires didn't have sex! But it was penetration, and therefore uhm, sex. She confused the hell out of me as a teenager.