You don't need one.

Dennis after a couple of beers needed to relieve himself on the way back to his friends apartment.

He said to his friend's hold up I need to go as he looked around for somewhere to squat behind.

His friends just said isn't it a pity you can't do this anymore as they unzip there trousers whipped out there cocks and pissed up the wall.

He stood there annoyed by his friends attitude desperately needing to go.

He took off his knickers and said to his friends you don't need one of them to be able to piss up a wall.