My late teen DC think its a bit obscene. But I have very happy memories of skinny dipping. - ie swimming nude - as a teen and a student. It was only a couple of times but it was a group of us at night - once (sort of) breaking into an indoor pool and another time outdoors. It was such fun and very spontaneous. Its felt so free and liberating.
Most recently I did it in a billabong in Australia with my boyfriend. I was 50 and it a was in a remote area and nothing sexual about it. Just bloody lovely. Swimming in a river and some little waterfalls in the nude.
But when I mention it to people they seem very prudish about it and very few of my friends have done it. Have we lost the spirit of freedom and nature?