John Mayer is a talented musician who has quite the rep as a ladies man. This modern-day Don Juan loves them and leaves them. He's dated so many famous women. A few of these females may have left him because of his wandering eye, but he's certainly been known to walk away.

John Mayer is a bit of a heartbreaker, but is a guy who's so fickle about women really a prize catch? Not so much. maybe.

What is it about this guy? Why do women get so enchanted with him, even though his dating history is positive proof that he's likely to move on fast. Is it his looks? His music? His wit? This guy obviously has some, um, finesse in the bedroom. He should, too, because he's had tons of practice.

Let's look at some ladies who did decide to date him, plus ten others who probably wouldn't touch him with a ten-foot pole.

20 Taylor Swift (Dated Him)

Oh, the saga of Taylor Swift and John Mayer! She dated him back in 2009, according to Much.com. She was 19 and he was 32. Taylor and John didn't last long, perhaps because the age gap was pretty sizable.

The relationship seemed to leave Swift with a bad taste in her mouth. She vented by writing the scathing song, "Dear John", which begins with a guitar solo that is reminiscent of Mayer's own guitar work.

19 Selena Gomez (Wouldn't Dare)

Selena and Taylor are friends, so Gomez is very unlikely to take up with John Mayer. She knows all too well what Taylor claimed to go through while dating John, and just how little Swift would enjoy seeing her with Mayer.

Selena has a lot on her plate dealing with the fallout from Justin Bieber's surprise engagement and wedding. It seems like romance isn't foremost in her mind, especially, with John Mayer.

18 Scheana Marie (Dated Him)

Scheana Marie from Vanderpump Rules is known for getting caught up in her romances. No matter how many times she's disappointed in love, she believes that each new relationship is going to last forever.

She may actually have had a tough time believing that when it came to John Mayer. Even someone who is a hopeless romantic would struggle to believe that John would provide a "happily ever after" experience.

17 Brandi Glanville (Wouldn't Dare)

Brandi has been burned before. Her split from dimpled ex-husband, Eddie Cibrian, was a pivotal event that basically scarred her for life...and we don't mean plastic surgery scars.

Brandi has been through a lot of emotional pain, so she might shy away from dating a player like Mayer. Brandi did get together with Gerard Butler, though, according to Bravotv.com, and he's been known to play the field, too.

16 Minka Kelly (Dated Him)

John has dated some ladies that a lot of guys (and gals, too, as it happens) would consider ideal mates, including beautiful actress, Minka Kelly. No matter how dazzling his girlfriends are, he eventually moves on. John and Kelly didn't date for long, and their breakup was "quiet", according to People.com.

Minka, who appeared on Friday Night Lights, didn't want people to know about the split at first.

15 Jordyn Woods (Wouldn't Dare)

Jordyn Woods is always looking for publicity, but, after kissing Khloe's ex, Tristan Thompson, while Tristan was still involved with Khloe, she's looking for good publicity.

She's gotten dragged so hard, and dating John Mayer might leave her at the mercy of cruel online trolls once more. The odds of things working out with John Mayer would be slim to nil, and people would mock her for even trying.

14 Katy Perry (Dated Him)

John seemed somewhat emotionally invested in his relationship with Katy Perry, but his level of commitment never really seems to hit one hundred percent, does it? If it did, they would still be together.

One juicy fact is that Katy rated John Mayer's romantic, uh, skills, higher than she ranked her current fiance's skills. She's engaged to Orlando Bloom, who came in at number two on her list, according to Elitedaily.com.

13 Charlize Theron (Wouldn't Dare)

When Charlize dated bad boy, Sean Penn, she ended up ghosting him. Clearly, she doesn't stand for a lot of nonsense, so she probably wouldn't get much pleasure out of dating John Mayer, who has always got an eye out for other women.

Guys who date extensively tend to be hard on their partners. Charlize has better things to do than get involved with John, don't you think?

12 Jennifer Love Hewitt (Dated Him)

Jennifer Love Hewitt dated John and she personally does not believe that Mayer wrote, "Your Body is a Wonderland" about her, according to Ibtimes.com. While her relationship with John didn't last, just like all relationships with John don't last, she is gracious when it comes to her famous ex. She still thinks he is a cool guy.

11 Tammy Hembrow (Wouldn't Dare)

Quite recently, Tammy got some shade because Tyga supposedly rapped about her, and the rap was very crude and graphic. The rap might not have been insulting. It sort of seems like a compliment. It featured some remark about a wet wipe that, while not cryptic, is somewhat open to interpretation.

Anyway, after all that, Tammy may not be interested in dating a famous music star.