Well, passion and attraction aren't rational, conscious decisions, certainly. But at the same time, our experience of nakedness in modern times is fairly artificial. In our "natural state" people would see each other naked a lot more often - and I don't think that means everyone walks around with erections and sopping wet pussies. That isn't to say that boobs and butts cease to have an erotic effect on people, it just means that their effect is based in context. Know what I mean?
Also, I smoke cigars too, but yours is much bigger...