We have some theories, but they aren’t particularly well established.
Things like obvious sexual characteristics and feet have potential physiological basis. There’s some ideas about supernormal stimulus and conditioning for these and more esoteric ideas. There’s an obvious pitch that we’re pre-wired for sexual selection, giving us a natural set of fetishes, but it’s remarkably inconsistent and random for having an alleged genetic component.
The ELI5 answer is “we have no concrete answer, but a lot of theories.”
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