I'm surprised this sort of thing is still going as it seems a very dated concept...
"Tell you what, let's all get our togs off for charity!"
"Smashing idea! That'll score enough attention, and what a wheeze!"
...from the innocent days when harmless eccentricity and sexual perversion were easier to combine, and everyone enjoyed making Mrs Whitehouse indignant.
But yeah, these days we realise there will inevitably be some perverts involved, and that's a rather depressing fact to have to ponder.