Yes, I've witnessed it as well. I was actually quite naive as to what was going on and commented to DH when were at the park with DD one day about the amount of men hanging around and going in but not coming out for aaaages. I actually thought they we doing drugs in there, but no.
When we were kids at the beach one day, my younger brother went into the public toilet block and came out seconds later, freaked out beyond belief... he had seen a group of men going at it!
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