Liberace's Ex-Lover Matt Damon's a Gay Sex Pro

EXCLUSIVE


Matt Damon
's gay sex skills are OFF THE CHARTS ... at least in his new Liberace movie "Behind the Candelabra" ... so says Liberace's real ex-lover Scott Thorson.

Thorson was out in NYC yesterday when we asked about the famous sex scene in the movie -- when Matt unleashes the fury on a buck-naked Michael Douglas -- and Thorson replied, "Matt sure can pound!!!"

Thorson says he was pleased as punch at the way Matt portrayed him in the movie -- but there was some collateral damage ... Thorson says, "I bet you Catherine [Zeta-Jones] is a little jealous."

Hay-oh!