Flannelette posted:

It depends if pee is stored in the balls or not, pee in the balls will make them swell and displace water.


Your body displaces water because it displaces that water, we don't care about things floating or not here. When you pee your bladder shrinking doesn't make you smaller and the water isn't going to rush up your junk and fill it back up again no matter how many deviant posts you've drawn of that.