Playboy's 55 Most Important People in Sex

Playboy is out with a list of the 55 Most Important People in Sex and Hugh Hefner isn't No. 1. That honor goes to Alfrey Kinsey, for his two groundbreaking books about sex in the 40s and 50s. Hefner ranks third on the list. Marilyn Monroe is fourth, followed by Monica Lewinsky and the Rolling Stones. Madonna is No. 10.