Sometimes you shave your body hair off in order to help make weight; This was even recently shown in an episode of the wonderful MTV news/documentary show "CAGED" (which so far in each episode shows all the guys getting weighed in before each of their matches):
{The following is taken from a website about the show & the episode(s)}
"Matt "Danger" Schnell is the dark horse. If there is a breakout star to come from this show, I am prepared to announce that it will be Danger. Of the three this week, he is the only one who not only fights, but is consistently cemented in the MMA world. He begins in his dojo, The Karate Mafia Gym, working out with a team partner, Delanie, who serves as a counterpoint to, well, how awesome Danger is. After all, of the three, he is called the "most promising."
He is the most in-shape, with pecs that are too unreal for reality television, and a pretty boy face made for the screen. He is also the best fighter. In the premiere we also get to learn how he got his nickname: he accidentally hurt his training partners. He is arguably the most committed to making this his career, as he recently quit his job to dedicate himself full-time. After all, he was the hero of the episode, defending the honor of Louisiana against the "Texas Invaders!!!!" in the audience.
Also of note: Danger needs to shave his body in order to make weight. I can just hear the ladies purr as he rubs his newly "silky smooth" body. / Fanservice moment of the episode."