That used to happen to me when I was a kid and was sick, and took a Sucrets (I think that's what it was called). What kind of bullshit medicine will suppress your ability to cough, but not the need?
Maybe we're lost in the desert/jungle/tundra/whatever and are starving.
Or maybe back in the caveman days, some people would just be curious.
Also, would the anus really be seen as so gross if nothing about it smelled bad?
I chose the second yes.
Seriously though, if Toonami and ASA are anything to go by, anime has went way down hill since the days of Cowboy Bebop, Trigun, and FMA.
It's possible. I once went like 11 months without porn/fapping. And this was like cold turkey after fapping every day for years.
EDIT: Guess I should add I was/am a 4ever alone virgin too.