Charlie Sheen and wife Brooke Mueller reportedly enjoyed ménage à trios with another woman during their 21-month marriage.
The alleged threesomes were said to have taken place before the Two and Half Men star was arrested for threatening Mueller with a knife during a booze-fuelled argument.
"Brooke is bisexual. She and Charlie have had more than one woman share their bed in the short time they''ve been married," the Sun quoted a source as saying.
The insider added to a US website: "Some of the women they slept with also did drugs with them."
The couple, who share two children, was apparently receiving treatment for drug and alcohol problems.