Well in IRL Genital Nullification surgery is actually a thing, you can just get rid of having a dick and such so i was expecting something similar, granted you would obviously still have a urethra hence why i said the body workshop's reasoning is a poor excuse since it just makes fun of you and goes "where would you pee from? your ass?"
like i said regarding the porn game part, null as a fetish is like extremely niche so i understand why its absent, since you would need to write around that... absence of dick or pussy.