Drugs can be used, abused, or abstained from.
Prostitutes can be hired, abused, or abstained from.
Polygamy can be partaken of, abused, or abstained from. Polygamy, however, seems more like a mental illness to me.
While drug abuse and the abuse of prostitutes is problematic, neither drugs nor prostitutes indicate mental illness for the simple fact of engagement. Engaging in polygamy, from the outset, however, seems downright crazy. Most American men, to judge by those I've known over time, can barely keep up with one wife, if they can keep up at all. Sure, they say they love their wives, but they don't always act it. Wanting a second, third, or even fifteenth wife seems, well, insane.