Boiling it down to a purely biological process is oversimplified. Unless you are getting aroused whenever you see an attractive person, simply removing clothing isn’t/shouldn’t be a variable. You’ve been socially conditioned to think of all nudity as sexual. Spending time in a nudist area is somewhat about decoupling nudity and sex. (yes there are those that go for the sex, and it’s kinda the leading reason.) I think the point of being human is all about control over ones self and environment. Hell humans have spent more time on this earth walking around naked than clothed. Our current views on nudity and sexuality is relatively new due to social, political, religious, and practical reasons. (you don’t want someone nude preparing large amounts of food or people in hospitals being needlessly naked for obvious reasons.) Ultimately I’m saying if you are worried about being in a public nudity area and not being able to separate the other human from their body/attractiveness, it might be something you should explore. So you can be more open to others in general.