Anyone get a public hardon without planning/wanting it at a nude beach or nudist colony? What was the other people's reactions? Were you embarrased?

I've been a member of several nudist resorts, with my first wife, my second wife, who passed away in 2006, and presently with my second wifes sister. Even though there is more than enough pussy, tits and cock for everybody to look at, I myself have never sprung a hardon that was not intended. When it does happen, the ideal thing to do is jump in the pool, or go back to your tent, cabin or apartment and make good use of it.
I have seen several guys that sit around the pool or hot tub, carefully looking at all the women, probably with the intention of getting a good boner. My lwife also loved to look at all the cock she was not able to put to good use too.

yip, happened at nudist beach on Malorka. I just dove into the sea lol

Supposedly it's not a big deal as long as you don't play with it in public.