You get banned from tennis if you grunt loudly in play
You see, such noises distract the other players all day
Less distracting sounds like passing the wind seem okay.
Maria Sharapova has been criticized over her extremely loud grunting during play, but you can bet they won’t try this with a champion like her. A 9-year-old Australian girl has been banned from playing tennis at her local club over the grunting noises she makes during play.
Lauryn Edwards was told last weekend that she could no longer play after an opposing player complained about her grunting”
http://snafu-ed.blogspot.com/2008/02/9-year-old-sharapova-wanna-be-banned.html