I was just reading Ali Eteraz' excellent post on Muslim Polygamy in North America.  I responded there, and I'll repeat it here:

I have been offered marriage as a second wife.  It is a girlfriend kind of thing.  The idea is he comes and sees me, we have a great weekend, he leaves and takes his dirty underwear with him.  But he takes his dirty underwear back to his first wife who then has to wash them along with all the other laundry and care for all the detritus of their lives including the burden of not being enough for him no matter what she does.  What ass would even think that a woman with any self-respect would do that to another woman?!  Urgh.  I was talking to Hedonist about this the other day.  You know how much she has posted on this issue.