After all these years, OK! Magazine has uncovered the truth behind Taylor Swift's inability to keep a man: She doesn't do the Horizontal Mambo!

A so-called "source" says, "Taylor's not ready to have sex,  so guys keep getting frustrated and moving on."

But things might be different with her current boyfriend, Scottish DJ Calvin Harris.  Because the source says she was up front with him about her, quote, "need to take things slowly," and he's the first guy who's willing to wait.

Hm, very interesting.

 

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