Thousands of fans, writers, nightlife legends and artists walked between the legs of a towering inflatable Madonna last month—a fitting monument to four decades of Madonna's subversive expression of female sexuality and autonomy. The giant inflatable served as the entrance to Club Confessions at the Knockdown Center, where she celebrated Confessions II, her 15th studio album and sequel to her landmark 2005 album Confessions on a Dance Floor. The…