Maybe Lindsay Lohan's rehab boytoy Riley Giles wasn't lying when he said LiLo had replaced her drug and alcohol addiction with sex.

Another one of Lindsay's bedroom rendevous are blabbing.  Self-proclaimed model Alessandro diNunzio told the News of the World that he met Lindsay in a bar at the Capri Film Festival and less than six hours later she stripped down for a wild night of hardcore sex.

"Lindsay was very, very good and surprisingly experienced," diNunzio blabbed.  "She wanted to do everything, every position. She was extremely flexible and adventurous."

Alessandro says he wasn't Lohan's only bed buddy during her 24 hours on the Italian island, and when he found out about the others he was heart broken.

Lindsay has turned into a man eater!  Work it out girl!