Some Anglican churches have threatened to break away because of the ordination of a gay bishop by the Episcopal church in the US. Steve Gray of the UCC Indiana-Kentucky Conference said he supports gay marriage but worries about the cost of this decision.

NPR: Church Endorses Same-Sex Marriage

"Combine this with the fact that marriage can be an important source of income for women, and it follows that prostitution must pay better than other jobs to compensate for the opportunity cost of forgone-marriage market earnings, " Edlund and Korn conclude.

FORBES: The Economics Of Prostitution

It may also help to explain the unusually low marriage rates among the best-educated and best-paid women, for whom the opportunity cost of giving up a career to have children is greatest.

ECONOMIST: Asian demography: The flight from marriage | The