You are suggesting that visual stimuli have nothing to do with sex? Of course, that's an interesting theory but if you look at nature you'll find visual stimuli is quite commonly associated with sexual reproduction. Humans are no different. Birds often have colorful plumage to attract mates. There are numerous examples. Makeup is designed to mimick a sexually stimulated female - flushed cheeks and lips, hot and red with coursing blood. Feminine features are innately and instinctually attractive. Now, youre right this natural attraction often gets perverted, but that doesn't change the basis of visual sexual stimulation having a basis in nature. There is a weird theme running through this thread that suggests that humans have somehow escaped the evolutionary and necessary reproductive urge associated with all other living creatures. We've not. Our culture tries to elevate us above our animal instinct, but without culture we devolve quicky. It's almost the opposite of what some are suggesting here.