This week: We trade stories about sex in museums and other public places and talk to New York’s art critic Jerry Saltz about why art is hot and which museums have lockable bathrooms. Also, can having more sex maybe possibly in any way make you less happy? A new study says so, but, we conclude, that is insane. And just how random should a person be for optimal rando sex? With Alison Davis, Maureen O'Connor, and David Wallace-Wells.