Investigative celebrity blogger and biographer Ian Halperin claims Brad Pitt dumped former wife Jennifer Aniston because he believed she was a lesbian.

In an entry on his blog last week, Ian revealed that a source named Toni, who is reportedly a friend of Angelina Jolie, claims Brad started dating the Academy Award winner because Jennifer didn’t fulfill him sexually.

“Brad likes to have sex a lot and Jennifer never wanted to sleep with him,” Toni allegedly said in an interview with Ian last week.

“He started to speculate that she was gay, though he never caught her with another woman or anything like that. He was very frustrated for a long time. Then he met Angelina, who is insatiable in bed, and the rest is history….He really did love Jen but she just wasn’t fulfilling his needs.”

Toni continued: “I don’t really know Jen and I found it hard to believe she swings both ways. When Brad confided his suspicions, I told him, ‘no way!’ But when she started dating John Mayer, I thought hey maybe there is something to Brad’s theory.”

“Everybody knows that Mayer is gay,” she laughed. “Not a big secret. I can see the appeal of him hooking up with Jennifer but what does she have to gain by dating him if she’s straight?”