George Papantoniou said:
That's ridiculous. It's probably propaganda against nudist beaches... There is no reason at all for someone to get more excited seeing a nude person than seeing one that is dressed (at least, with a swimming suit).
I have been the target of two gay persons jerking off, once in Belgium (I was dressed in full outfit and jacket) and one in Greece, on the beach (I wore my swimming suit). They both had no problem mastrubating, without seeing me naked. I have no problem with that, they can do what they fancy as long as they don't bother me...
I have personally been quite excited by fantasising doing things to women I saw wearing clothes (swimming suits, for example), although I have never tried to masrtubate in public. I could do it though, if it was considered "correct" by the rules my society has made for me to follow...
Just as an aside, I'd like to make it clear that as a gay person, not all of us are so inclined to stalk members of the same gender we find attractive and masturbate in public over them.
Getting back to the nude beach thing though, I've had some very interesting responses when photographing models on the beach in San Francisco (yes, there are actually several nude beaches in San Francisco, one of which is very scenic and very rarely busy). Once, I did have some strange person follow me and my model around, at a fair distance. All he did was watch, so in the end no harm, no foul, but it was a bit unnerving.
Another time I was out with a model on that same beach, we had gotten into what we were doing and lost sense of our surroundings, so we were a bit surprised when this dog came bounding in to the area, toting a tennis ball. Shortly thereafter, its owner came along, and his reaction was, "Nice day for it! Y'all enjoy yourselves!".
So not all Americans are sexually repressed victorian nutcases

. Then again, this was in San Francisco.