Why? Its the saddest, dumbest thing I've ever seen and only makes the game worse.
If you do it please stop. Anybody flopping in a pick-up game with NO refs deserves a Metta World Peace elbow to the dome.
I hate this, the fact that there's no FT's shouldn't dictate how you guard someone. It isn't really basketball anymore when someone tries to go up after a board and they get borderline mauled.
Kudos to you though for recognizing and embracing an un-ethical loophole in a social activity that has no real consequences. *Thumbs up*