Innate: attraction to favorable survival traits like intelligence and good health, attraction to erogenous body parts, the impulse to actively pursue, (mostly for men) the impulse to provide food, shelter and amenities, (mostly for women) the want to appear attractive leading to things like makeup. Oh, the the pistoning.
Environment, intellect: attraction to popular traits, choosing a particular body part that one most enjoys in a mate, appreciation of quirky or unique behavior, looking for common interests, more advanced foreplay—more than just general kissing, sucking, petting, etc.—like learning particular sexual needs of an individual, different sexual positions, and deciding who cleans the sheets.
These are of course just things I've noticed. I don't know how common this could be applied, and to be honest I've forgotten a bit of my sexuality courses from college.
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