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Eliezer_Yudkowsky comments on Babies and Bunnies: A Caution About Evo-Psych - Less Wrong
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That looks like just the evo-psych kind of reasoning Alicorn is warning against.
Compare: given 5000 species of mammals that are guaranteed to have many physical features in common with humans, shouldn't some happen to super-stimulate our sexual attraction just by chance? Why would mating choice be that much more strongly selected than baby nurturing behavior?
ETA: some good explanations for this difference have been proposed in the comments below:
Actually, it makes perfect sense for sexual selection on sexual-attractiveness-features to be subject to far greater selection pressure and fine-tuning than baby-cuteness.
I'll make a testable prediction here: Cases of parental superstimulus (like baby ducks following a stick figure, infant monkeys getting attached to puppets, etc., if I'm remembering correctly) ought to be far more common / easier to fake than sexual superstimulus. I'll limit the key part of the prediction to complex vertebrates so that they have large enough brains to be complicated, but I wouldn't be surprised to find the rule more universal than that.