This. What is wrong with nudity? What is wrong if a child sees a dick or a titty? Why are ashamed? Why is nudity such an awful thing?
The lack of real analysis demonstrated in this topic, the western centric thinking (US vs. Europe), and broad generalizations are just disappointing for a forum full of supposedly smart people.
More nuanced version of my post - cultural memory is frequently anti sex in many situations almost anywhere you go. Confucianism has tons of taboos around sex. Hindis have fewer but Indian society still has a lot of leftover laws from when the Protestant UK was determining social policy.
The places you see sex positivity and a lack of taboos over nudity are much more secular on measure.
It's obvious that religious beliefs have poor epistemological backing and (to me) idiotic to hold. But I'm curious if you've got some novel hypothesis for their existence.
As for why uncovering oneself is a reasonable mating ritual, I believe it is similar to how in the same way that if you have a gun and are going to shoot someone you would indicate as such to ward them off by pulling your gun out of its holster.