Joh Without the chain swimming is possible. With boxer shorts and a swim shirt you can hide your equipment. Especially when you at a not crowded beach nobody will notice it from the distance.
If the clothes are wet, I think it is very likely that the equipment becomes visible. I don't think that I should use a pool on a place that is accessible to anybody while I wear my equipment. My best chance would be a private pool, but of course anything with a private pool is very expensive (like booking a place with a private pool for honeymoon). At the end I think I will just not be able to do swimming a lot in the future. I don't like this aspect but I think I receive more in return then it costs me.