Does polygamy raise or lower IQ?

I don`t have a definitive answer to that old evolutionary theory question, but I wanted to cite this one bit of data from that Iraqi terrorist who evidently tripped and blew himself up in Sweden:

In a recent profile he placed on an Islamic dating Web site, Muslima.com, the younger Mr. Abdaly appears as a tall, stern-looking, neatly dressed man standing in front of a white curtain, his dark hair cropped short, with a trimmed black beard.

â€?I am married since 2004,â€? he said on his dating profile, according to a translation of the original Arabic. He described himself as â€?very religiousâ€? and said that he had two daughters, aged three and one. â€?I want to get married again,â€? he said, â€?and would like to have a BIG family. My wife agreed to this.”