Probably something I will never do, but it's something I've thought about.
My ex-girlfriend always went topless on the beach and at the hotel swimming pool and she also have changed in front of a window numerous times, but I've never once encountered a photo of her online posted on some forum like this. This was always a disappointment. With my current girlfriend, to increase the odds, maybe I could exchange contact information with a beach voyeur, so we can go to the same beach at the same time.
But the longer I think about it, it just sounds too weird, and a little bit too creepy.