If you've watched Rihanna's video for her latest hit "S&M," you actually got a look into her sex life. In the latest issue of Rolling Stone, the Barbadian beauty admits she loves being whipped and spanked during sexy time by a man who takes charge. While her comment definitely got people talking, she wasn't the first to confess to unconventional activities in bed. From playing with knives, to leaving mementos, to using a leather body harness, some celebrity women have gotten creatively kinky over the years. We've compiled the freakiest of them all.