Pedro, I had a similar experience last week at a nude beach. I came back from the water to find a gay guy camped a couple of meters away from my blanket. This particular beach starts with a clothed area, then a nude straight area, and then a gay area. I was camped on the clothed-straight nude line, hundreds of meters from the gays.
Anyway, this fully dressed gay blade is all excited and moving his mobile phone around trying to get the perfect "cock shot" of me. It took me two seconds to figure that out and he probably got some nice shots of my backside heading back into the waves. When I returned, thankfully, he was gone.
My big fear is winding up a "straight photo boy" on some gay website, and I am sure you wouldn't want that distinction either.
I hope I don't live to regret the decision, but later the same day there was a very cute, but fully clothed, young woman a few meters away over the clothed-nude dividing line also taking mobile phone snaps, and probably video of me coming and going to the water and lying on the beach. I confess here, anonymously, that I saw what she was doing and actually made an extra trip or two to the water, and gave her the shots she was looking for. I got such a "rise" out of it I had to stay in the cold water for a while.
I have had young women taking my picture on almost every trip to the beach this year, usually it's the over the shoulder shots with them in the frame and me in the background. This was straight ahead just me. I assume, probably foolishly, that these women may share the photo's with a few friends, but mostly keep them to themselves and do not publish them online. But with the gay guys, you never know where that picture will end up and what the caption will be. Thankfully, I have only seen gays taking my picture a few times. I have never given anybody permission to take my picture on the beach, or publish them on the net.
With new software that searches for pictures of faces the way Google searches for key words, I should be afraid that all these pictures will surface one day. At least that threat is incentive to stay in shape.
