Serial celebrity shagger John Mayer is keeping a detailed journal of his highly-publicized flings with some of Hollywood’s most attractive entertainers. Mayer’s so-called “Fame Book” chronicles the “Clarity” singer’s short-lived romances with singers Jessica Simpson, Nicole Scherzinger, and even actress Cameron Diaz.

According to a CBS 2-Chicago Entertainment report:

Along with personal photos he’s snapped of Simpson, Diaz and the rest, he includes notes sent him by the women, clippings of celebrity magazine articles linking him with them and printouts of e-mail messages they’ve sent him.

“Just think what that would go for on eBay,” a Mayer friend chuckles.

So what makes Mayer so irresistible to women?

“He’s very old-fashioned about a woman — opening doors, standing when a woman comes to the table … things like that…..When he’s with a woman, he makes her feel like she’s the only person in the room — even in the middle of a crazy, busy, loud nightclub,” says a CBS source.

“Even when it comes to bringing or sending flowers. John doesn’t just grab a bunch of roses. No, he will pick out individual flowers and create his own personalized bouquets. I’ve heard him spend 45 minutes on the phone with a favorite florist, methodically describing exactly what he wants.”