For once I agree with Bob. Time after time, we've lost nude beaches because they've been used as gathering places for gay men looking for sexual encounters, "cruising" as they call it. It's never clear that closing a place to nudity causes the guys to go anywhere else, but it's all too common as a result. And out of some combination of political correctness, and a desire to keep quiet about problems, naturists just won't say a word about it. They'll say "sexual activity" but never the fact that it's gay men doing it. Yet I've never heard of a beach being used for heterosexual sex! Yes, women can expect sexual harassment and that's a problem too, but it's not the cause of beaches getting lost to nudity.
Back around the year 2000 we had a crisis involving the best-known nude beach in New England, The Ledges in Vermont, which is on a lake used for hydroelectric power. The gay guys were having their fun sometimes within sight of some neighbors, and a property developer tried to use that fact to get the inconvenient nudists chased away. Naturists ended up winning the fight by a hair's breadth, but I learned then that our organizations (I mean particularly the Naturist Action Committee) may think there are political reasons not to tell the whole truth, even to naturists. I think it's a sad thing when that happens. I've met Bob Morton, the head of the NAC, quite a few times and in fact he's a great guy and we like each other, but he's likely to ask me "So what are we doing wrong now, John?"
Unfortunately the same thing has happened again several times over the years, and we've lost most of the battles. San Onofre in California, Meech Lake in Ontario, most recently Mazo Beach in Wisconsin--all locations which were also gay hangouts, which naturists couldn't defend because we couldn't admit what the problem was. And the ban on public nudity in San Francisco, where the problem was exhibitionism, which we could and should have called out and denounced--we just had to let it happen while we claimed the issue was nudity.
Sorry to rant. But I've seen too many defeats happen while nobody was willing to name the cause. It's been a long enough period now that I'm pretty much resigned to it.
Edited to add that by refusing to address this problem, naturists make it impossible to talk to gay men about it. There are gay naturists and not all of them are irresponsible--would we get anywhere if a dialog could occur? Success wouldn't be guaranteed, but at least we'd have made the effort. Yet it can't be done.