During my years in USA as a student we went to visit some beaches. A friend (American) and I walked for a long time and did not realize we stumbled into a so called 'clothing optional' beach.
I can tell you it was not a fun thing to watch. It is far from sexual. People were having fun playing volley ball (men and women) buck naked and totally unaware. I was actually holding a camera for my friend and we both looked stupid being the only two people wearing swim clothes.
Human body is far more appealing when it is properly covered up. Plus we were relatively young but some of the sights of older women and men without clothes is a huge turn off. Photos and images may look titillating but in reality that is not the case.
Also, the people in such beaches are not there as sexual beings or immoral people. They enjoy their freedom without bothering anyone. I have known a few people who are nudists (men and women) over the years and they are just normal people with this need to assert their freedom in clothing optional places.
In America, in most gyms equipped with shower facilities people walk around totally naked.
When my parents came to visit me, I took them to show the place I used to work out. While I was talking to someone my mother and father had wandered off to the locker area. They were scandalized to say the least because I had not warned them. And the young women in the locker area were surprised to see my mother fully clothed in a sari
Anyway there are cultural norms that differ from place to place.
Eastern thoughts continue to have great influence in the west - meditation, yoga (30 billion dollar industry in USA alone), Pranayama etc. Many of my friends who study Vedanta and Sanskrit are actually Americans born and raised in USA.
Western dresses and habits have made major inroads into India and all over the world. There is some fusion too - I have seen scantily covered women in a sari.
World is becoming one big melting pot
always!'
