I hate to reference anything Maureen Dowd has written, but she's penned an interesting and lengthy "What's a Modern Girl to Do?"(via drudge) that has the following statistic:
A 2005 report by researchers at four British universities indicated that a high I.Q. hampers a woman's chance to marry, while it is a plus for men. The prospect for marriage increased by 35 percent for guys for each 16-point increase in I.Q.; for women, there is a 40 percent drop for each 16-point rise.