There are times I think the world would be a far better place if, for one day a year, men and women traded their sexual equipment. Of course, nothing would get done because of all the subsequent masturbating, but then again, we probably would achieve world peace for that day and just about everyone would be a) in a great mood b) too tired to cause trouble and c) extremely raw in certain areas.
But it should only be for one day a year, so that people wouldn't get jaded with the concept. Or maybe a few days per decade, selected at random. Too much repitition and it would lose all the fun of the concept.