Intersting. That old guy looks like my old high school PE teacher!
Before we retired we spent a lot of time at nudist resorts and unoffical nude beaches. Actually very relaxing and pretty much just like on regular beaches... that is until we played a few exhibitionist games.
Fast forward to retiring south and meeting older adult nudits who were into sex acts in public more than browning their boobies. Sadly cameras were not allowed but the memories are etched into our brains. Seems like the two beaches we hung out had unoffical sections for regular nudists, exhibithionists, active sex acts, and gays at the far ends.
We have never been people who just lay on a beach so spent most of each day slowly working our way from one end to the other. Often we'd participate in what happened in each area. Well all but the gay part. However I did learn gays love playing with tanned titties.
We have to thank some of those perverted old nudists for helping me convince my wife she is not too old to be used as a sex toy by old men....and a few old women.
Sorry no pictures. But it should give others ideas.