this might come as a shock but I feel kinda uncomfortable talking too directly about sex and what arouses me to the public, and I'm not fully sure why. Some theories:
1 latent sexual shame that can only handle being publicly sexual when it's clearly compartmentalized
2 fear people will lie to me to make me think we're sexually compatible
3 i haven't seen other ppl do it yet
4 people might actually arouse me and thus have control over me (??)
5 People are actually hardwired to keep this info private, the same way we are hardwired to feel uncomfortable naked around other people in non-intimate situations.
I disagree. Socialization shapes it, but I'd venture, to a first approximation, girls entering puberty naturally start feeling awkward naked around strangers - and their male relatives.