(Ep. 126) Kamesennin was just wished back to life by the dragonballs and he hasn't changed ONE bit!
(Ep. 126) and another scene involving Goku having to go potty... note the looks on Kami and Mr Popo's faces and less than a second later, they fall backwards.
(Next scene) Goku rushing off to the bathroom and it looks as though he can bairly make it to the toilet without wetting himself a little...
(Also in ep. 126) Goku is starting off his training with Kami with some meditation and he has to pee....AGAIN! i think you need to cut back on the liquids Goku LOL (either that or it appears to me that Toei has this obsession with Goku taking a leak...) no wander his Candy cloud is yellow lol (just kiddin'!)

Although there is occational references in DB involving the other characters needing to relieve themselves or showing them naked...in this series (unedited version) you see more of that from Goku than any of them.
(Ep. 37) Murasaki's porno magazine collection...
(Ep. 21) Kamesennin asking Bulma if he can give her a puff-puff.
(Ep. 21) The announcer is wandering about an opponent's weak spot and Goku replies saying it's your balls...
Bacterian during his match with krillin in ep. 21... he sticks his hand down his underwear and rubs his genetalia to get as much of his stench on his hand as possible.
Bacterian farting directly on Krillin!
More screen-caps...