The benefit it affords us is being able to easily write our name into snow. That can be pleasurable under certain conditions, mostly alcohol-infused ones. Beyond that the only pleasure I could possibly see is the relief to have made it to a toilet and not having pissed your pants when you were dying for a one. The length of the urethra is not relevant in that case. I've personally never pissed and thought the experience was physically pleasing - beyond what I've already mentioned.