With a heat wave sweeping much of the United States this week, many Americans are undoubtedly wearing as little as possible, and all that bare skin may have effects beyond cooling. As the premise of the indie film 30 Beats (out July 20) or the steamy ice-cube scene from Spike Lee’s Do the Right Thingdemonstrate, many people believe that sweltering temperatures have a tendency to push us into one another’s arms. Do high temperatures really contribute to an increase in sexual activity?