My wife and I go on nudist resort vacations. She has no problem being nude and I enjoy showing her off. At home she is shy and conservative. She will always wear a bra and panties when we go out. She says what will everyone think? At the resort she just blends in with everyone else! I sure she appreciates the admiring looks she gets from all the men! That is part of why she goes!

1. From a European perspective, and as a naturist for over 20 years, the majority of naturists would be 50+

That's much to do with them now being empty-nesters and able to indulge in something that they've maybe wanted to do their entire adult lives but the issue of earning a living, raising a family and so on gets in the way. The average age of Spanish and French naturists might be lower, 30s-40s, as any I've spoken to have grown up with that way of life.

2. If you're sneaking photos, expect to get thrown out and rightly so. There's a gender imbalance to naturism, it's much more attractive to males, and it's hard to get ladies to strip off to create a better balance. And it they're minded that someone is taking sneaky photos, who can blame them? Besides, it's all about being in the moment, not living the naturist experience second hand through a phone or camera lens.

3. Naturism is a magnet for gay people, men mostly, so expect there to be some emphasis on the gay lifestyle (i.e. certain bars bedecked in the rainbow flag, etc). They'll not be flaunting their sexuality, other than being drawn to certain locations. There's exceptions. Cap D'Agde in France is one where (hetero)sexuality is very much front and centre, but I wouldn't consider that to be a genuine naturist location any longer.

Cap d'Agde is just about being naked for maybe 20% of the visitors there. There are still families with kids, and I have no idea why as there are many alternatives for families.
The rest are people looking for sexual arousal or activities. One can see them everywhere. It is one of the most liberal places on earth.

Another thread
 

I have written another thread “can you be more exposed at a nudist club?” Giving our experiences at nudist clubs and resorts around the U.S. before cell phones in the 1970’s and 1980’s.

Yes, my wife was photographed without permission at Black’s Beach in San Diego and published in a girlie magazine full frontal nude. The guys at my office loved it but it was quickly forgotten. I have copies of the magazine I still share with friends and my wife doesn’t care. Who doesn’t in their 20’s?

As to sex, groping underwater is very common but so it is at our home pool with friends. Open sex in public? Only when a small group alone agrees to it. In California, in a large hot tub sunk into the ground with just us and a cute newlywed couple, we spoke and agreed sex was ok. We groped each other then we had sex side by side with our spouses.

More details in my thread.

At Desire Resort in Cancun, the would play volleyball in the pool. Mixed teams. The women were allowed to grope the guys but the guys could not grope the women.

In the rooftop jacuzzi, the guys at on the side and the women sucked their cocks. Later, my wife sat on the side and I went down on her. She quickly came and invited others to eat her.

Another thought
 

My wife and I got very serious early in our dating and she was never serious with anyone else. On our fourth date she met and got to touch and taste my penis. One thing she loved about nudist clubs and beaches was seeing the various shapes and sizes of men’s organs. She loved to see something new or exceptional and she talked to me about it. And seeing a man get an erection was believed to be a great compliment.

At my resort and many others I've visited, they would have been summarily kicked out. I've seen and heard of people getting reprimanded or kicked out for far less.

Besides the occasional random guy who does a "double-take" as my wife bends over or lays with her legs open, I can't say we've ever been bothered.

Erections
 

My wife and I have only been to nude beaches and AANR Clubs. In our experience, there is of flirting and some touching but it is not obvious.
-she will ask males at the shower if they would like to share a shower. What occurs is a lot of checking out who might be watching, like kids, and checking if they are ok with touching everything when soaping up. She has also soaped up females too and enjoyed it.
I have gotten erect in a shower with a lady I didn’t know. There were too many around to jerk me off in the shower and a bj was out of the question. Fortunately she was skillful and got me off while drying me with a large towel. My wife and I have both asked new shower friends to meet us after the shower at a more private location.
-in the jacuzzi with the bubbles on, most are comfortable touching under the water. I have been successful haveing nude ladies sit on my palm-up hand in the jacuzzi and slipping one or two fingers into the new friend. You can tell by her expression and her comments to you if you are doing a good job.Women have wiggled and asked me if I could stay for a while. Women tell each other things and I have been asked by ladies if they could sit beside me. “
I am a friend of xxx and she said I should meet you”
If the jacuzzi is not crowded or if people are spaced far apart, you can get jacked-off.
- the pool is a difficult challenge. If no one is around, just watch out carefully. On the west coast we shared a massive pool and we thought we interrupted a young couple making out. I asked them if they would be offended if my wife and I enjoyed some oral sex. In minutes, my face was in my wife’s lap and the young man was getting a bj beside us.
We have found many nudists and others enjoy seeing others having sex but you need to talk about first. And watching is not swapping. My wife and I have taught probably two dozen nudists how to prepare for great anal sex and learned how to do a great pubic massage.