I used to go to the beach regularly on days off. There were a lot of beaches around where I was living so I got to know the best ones. I wore a bikini bottom or a bikini thong until I was far enough away from the busy part and then strip them off. I would stroll down in the nude, maybe passing another nudist and find a spot sunbath. Wasn’t uncommon for another guy to stroll past. There is an etiquette that if you see someone in swimmers you’d cover up but if they were nude, it was okay to remain nude.
We’d check each other out and if there was some interest we’d chat and one thing would lead to another: masturbation, oral sex, sex. I also masturbated a few times while someone watched.
Don’t live near the beaches any more so hasn’t happened for a while.