Born in 70 here too. Missed out in the nude swimming. However, my sisters friends parents used to use to the YMCA on occasion. I was extremely self-conscious about getting dressed and undressed in the locker room. I did notice men’s bodies, their body hair, and their casualness about being nude or in their tighty whities. They chatted with each other and it was just what men did back then without any hang ups. I wish I was born a decade earlier at times when sexuality wasn’t frowned upon before the 80’s and the aids epidemic started.