I have heard many naturists claim that "nude isn't lewd" and "nudity is not about sex." All I can think is, you sad, jaded, passionless people. My wife and I are routinely nude around our house, around the kids, around family. We have a pool, and in the summer, my wife spends the vast majority of her time at home wearing just a thong bikini bottom, including family dinners, TV time, etc. Now, is that all sexual activity? Of course not. But even in our forties, I still easily get erect just watching her skim the pool or load the dishwasher nude or in her thong. And unlike naturists, I don't WANT to separate nudity from sexiness!
Our friend Anna (triad lover) spends a lot of time at our house, and she's a size 16-18, so she's a bit self-conscious of her body. She usually lounges in a one piece swimsuit, and wears some sort of lacy lingerie during sex. I think she looks hotter than hell in the things she wears, but I sometimes wish I could get her to loosen up and go nude more.
Personally, I love being nude, and for all the "nasty" reasons! As often as I have gone nude in life (a lot) stripping off my clothes, especially in front of other people, still gives my balls a tingle without fail. I love having my package on display, and if I start getting stiff, all the better. So I don't get "naturists" endorsement of nudity and aversion to erections, either. To me, one leads naturally to the other!
When nudity stops being sexy to me, I'll consider myself half dead.