Here are some shots from the recent Shanghai diving championships.
These costumes seem to be getting MUCH higher on the girl's legs and far briefer over their butt cheeks. The tall fit Chinese diver had to pull her costume out of her arse crack twice in 10 seconds - and all she was doing is standing still talking to her trainer!
Half a chance there'd be something else up slipping right up her ass - and she'll need more than a finger to pull it out!