@trueform
I also naturally hang to the left, probably because I’m right-handed. I don’t play water polo, but I love swimming, and my swim trunks feel pretty tight too.
However, I’ve never had the problem you mentioned. For one thing, I wear boxers for swimming; for another, both my testicles and my flaccid size are really small—seriously tiny. So they don’t stick out at all, and it even looks pretty flat down there.
I don’t feel insecure about it at all, after all I’m a bottom. But just kidding, I’m really envious of you. From what you said, your size is already amazing. I’m totally jealous hahaha!