Believe it or not, the MC1R genes that cause red hair are also responsible for other physical characteristics that make redheaded sex the best ever. The genes responsible for red hair also cause redheads to respond differently to physical stimuli than men or women with other hair colors. Redheads feel hot and cold temperatures more rapidly and respond to pain differently than blonds or brunettes. This heightened sensitivity can easily translate into exciting sexual play with hot and cold lubes, ice cubes and even sex toys that trigger heightened physical responses. You can only imagine what this might translate to in the bedroom. Redheads exude sexiness from their very pores.