Help Me Understand Something...

I've played tennis since I was in middle school, and one thing I've never understood why professional women players need to shriek when they play. Growing up, I've never heard anyone I've played tennis with grunt or shriek on a regular basis. It's really annoying and seems to take a lot away from the game. It seems to be a tactic used to distract an opponent and mask the sound of the racket striking the ball (which gives a good indication of how the ball will travel). Shrieking just seems like bad sportsmanship and something that is very immature for players that I feel couldn't really win without this atrocity.