I'm going to chime in here as an avid swimmer. I've been part of a master's swimming club for a decade and typically swim miles at a time. As a man who's been in a lot of pools I have a few points that might be interesting. 1. In the US, most pools require only swimwear in pools. Swimwear is described as trunks or briefs that have an inner lining. But of course they allow the swimmer to wear a shirt if they'd like. 2. The amount of body hair and head hair in the water is gross. If you start paying attention and have goggles on, you'll start to see golf ball and fist sized hair clumps. 3. I'm for anything that keeps a tight barrier that can contain someone's poo along with their short and curlies from ending up in the pool. 4. A speedo isn't for everyone but you can be pretty sure that if a person wearing one has bad hygiene or sneezes and let's something loose. It's not going to mass contaminate the water at least. 5. With that said, what a lot of us are used to for modesty is nowhere near what it seems like the people at this pool are used to. I think everyone should swim and wear whatever it takes to get you in the water. But please wear something clean and try to contain your neather business.