Argument: Legalizing polygamy will cause all women to worry about husbands pursue new wives
"Should Polygamy Be Legal?--Posner's Comment". The Becker-Posner Blog. October 22, 2006 - "A woman who wanted a monogamous marriage could presumably negotiate a marital contract that would forbid the husband to take additional wives without her consent. However, she would have to buy this concession from the husband, which would make her worse off than if he were denied the right (in the absence of a contractual waiver of it) to take additional wives. Allowing polygamy would thus alter the distribution of wealth among women as well as among men."