Khan, who does pre-marriage counseling, says she always raises the issue of polygamy with engaged couples.
"I also explain to them that as a woman, you have certain rights, and as a man, he may one day exercise his right to have a second wife," Khan says. "And usually the man says, 'No, no, no. I'm never going to do that.' And I say, 'Well, in case you ever get tempted, how about we put that in the contract?'"
What if he wants to leave his options open?