Shaved, waxed, depelated, lasered, plucked, ripped, is not important how, is important to be hairless. On male or female. I have described in a lot of my stories.
The reasons are many, various, multiple.
Cleanliness, submissivity, hair does not bother when playing games, practicality, especially when washing, erotic, aesthetics, feeling... When shaving or denuding a partner is a form of game, play, eroticism, supremacy, ... A consequence to a partner is a long-term feeling, and he, or she remembers who is in charge. A hairless state is a permanent evidence for a sub about his position.