As much as John Mayer is known for being one of the music industry's most talented musicians, he's also garnered quite the reputation as a playboy. After all, the "Gravity" singer's long list of flings, hook-ups, and on-and-off relationships includes some of Hollywood's most high-profile female stars. To be fair, we can't blame them. Can you imagine him singing "Your Body Is a Wonderland" on your couch while staring at you with those big, puppy-dog eyes? C'mon, it's no wonder women can't help but fall for John.