Mutual Coercion, Mutually Agreed Upon (Or, Having a Vasectomy to Justify Watching March Madness)

For men: Have a reason to be sitting on the couch and watching March Madness.

(I realize this is pretty lame for my first post in a month, but I'm posting this in honor of Garrett Hardin's views on population control, since I'm teaching "The Tragedy of the Commons" in class tomorrow.)