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I have been a Naturist/Nudist for more than 65 years.
Getting an erection at a Nudist Beach is quite common.
Women get hard nipples and wet lips also.
What you do with that is where you become an exhibitionist which most people would frown on.
The correct etiquette is always maintain eye contact.
That way you are less likely to be aroused, and you will be more acceptable in most situations.

Sexual displays at public nudist beaches a major reason that the beaches get shut down so be discrete especially if it's a family friendly beach.

That being said I have gotten erections in numerous naturist settings but try not to display it. We do like to use no clothes and sun to spread our legs and tan our genitals, actually we both get really black down south. I usually get a bit tumescent. My wife once had a couple local guys sit down about 15 feet away and start jacking off when we were at a nude beach in the French Caribbean.

We have fucked but not in a visible area unless you count discreetly in pools and hot tubs.

In my little bit of nudity experience, I tend to separate the nudist from the naturist.
To me, it seems the naturist feels going naked is no big deal and has no connection with sex. A nudist (which is where I fit in) does feel it as a sort of sexual excitement.
I have seen erect men on a nudist beach and personally it doesn't bother me so long as they are acting normally. I get aroused going nude like that and it's just more obvious for a man.
Having said that, I wouldn't think using a butt plug publicly would be viewed as acting normally, or anything else sexual. If you are somewhere quiet or discrete then it would be ok.

I started going to Hippie Hollow in Texas last summer. Liked it so much the first time, I went back a second time. The second time, I was out swimming and noticed a guy had put his towel down close to where I had my stuff. Although sexual activity is not really allowed, we were in a secluded spot. While I was out in the water, I noticed he was playing with his rather nice cock. Laying on the towel where he had put his stuff. I started getting hard.

I decided to get out of the water and go check on my stuff. He said hello and complimented my body and cock while he was playing with his cock. I laid down on my towel and did the same while watching him stroke his hardening cock. He moaned and complimented me again on how I look.

He asked me if we wanted to be alone...and I was cautious. I was like, "Well, I don't want to get in trouble or anything". And he said he knew of a secluded spot in the trees. I couldn't believe it, but I told him I wanted to go and we walked a ways to the place he was talking about. He kneeled in front of me and started licking my hardening cock. I moaned and said "Oh god...please...it's been so long...". His skilled tongue was licking the underside of my cock head so well and sucking gently on my big swollen cock head...I could not believe it. He found my most sensitive spots right away and expertly licked and sucked my hard cock while my head was tilted back, me moaning as he knew exactly what he was doing. He has total control of me and I could not believe how good he was! OMG, it was such an excellent and outstanding blowjob. I shot a big load in his mouth and he took it all. Mmmm...I still get hard when I think about my nude beach experience and jerk my cock often. I'm hard just typing this here thinking back on it. I hope to get back there this summer.

All that aside, I love being nude outdoors and frequently get nude in my suburban backyard. I may or may not have been seen. I don't know, but I'm not giving up my nude times at home. I love the feel of the breeze on my cock and naked body. It always feels amazing. Swimming nude at Hippie Hollow was amazing too. There were couples, single men, single women...loved it! I plan to keep going from time to time.