I knew only two in Saudi Arabia that had two or more wives. One was Saudi in their Air Force and the other was an American Muslim. The stipulation is that they cannot live in the same house and you have to provide equally for all. No wild orgies I'm afraid.
If you buy one a Mercedes you have to buy one for the other wives too.
You could always tell the men with two wives because they had double houses that were mirror images of each other. You did not see too many of these though.