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As a long-time nudist, I am often asked about sex at nudist campgrounds and resorts. Many people who have never experienced social nudism believe that being naked must be sexual.
The truth is that at the mainstream nudist clubs, those affiliated with the American Association for nude recreation, open sexuality is not allowed. But, does that mean that nudists are not sexual? Quite the contrary, being naked is such a relaxing and liberating feeling that nudists feel more sexual, but they confine it to their rooms and trailers.
I had a girlfriend, who, when we were in my trailer at the nudist resort, would start sucking my cock when the door was open. If someone walked by, saw us, and reported us to the office, that could get us kicked out, so I would make her stop until I closed the door. Usually, when people are banned from the club for improper behavior, it's late at night, after the dance and they have had too much to drink so their inhibitions and good sense go out the window. One lady was sucking one guy's cock and stroking another guy in the hot tub and was reported to management. Unfortunately for her, she had some very distinctive tattoos all over her naked body so management immediately knew who she was.
Sunbathing, swimming, playing tennis and volleyball are not in themselves sexual activities, although it is exhilarating to do them in the nude.
What about a hard-on? That's the most asked question by men. Since it's not a sexual situation, it rarely happens, and if it does, you roll over or cover it with a towel. Over the years, I have been with literally thousands of other nudists and have only seen a couple of erections. One was a teenager who fell asleep on a lounge beside the pool and when he woke up, his cock was standing straight up, just like a "morning woodie". He quickly jumped in the pool and the colder water took care of that. Had he strutted around the pool showing hard cock off, he would have been told to leave.
I have often been asked about swingers at nudist clubs. Of course, anyone who is sexually liberal enough to be a swinger will likely be a nudist also. All clubs have swingers, but they keep a low profile, and only swing in private. If you are not a swinger yourself, you wouldn't know who they are.
There are a few non-AANR clubs that are adults only, cater to swingers, and allow open sex. I know of one club which used to be a mainstream nudist club, but they switched to swinger because they could make more money. They even have "fuck couches" next to the dance floor.
There are resorts in other countries that cater to swinging couples and sexual activities are often seen in the nude areas. One lady told me about being at a resort with a nude beach. A large group of the guests were sunbathing naked and one lady started to put suntan oil on her partner's body. She oiled up his cock and started stroking him. He protested, but she insisted and kept stroking as he got harder and harder with everyone else watching. When he finally shot his load of cum, the group applauded!