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In this April 28, 2008 file photo, actress Lindsay Lohan poses on the press line at the LG Scarlet Series Launch Party in West Hollywood, Calif. [Agencies]

Lindsay Lohan reportedly plays the "passive wife" when she is with Samantha Ronson. The 22-year-old actress - who is rumoured to be dating DJ and singer Samantha - is said to adopt a submissive role in their alleged relationship.

A source told America's Star magazine: "Lindsay and Samantha are totally playing house and loving every minute of it. And, yes, they share a bed! "They both play certain roles. Lindsay is the passive one, the wife. It works for them!"

According to the magazine, the young couple also shop for sex toys together and have made a "bizarre" pact to stay thin. Lindsay and Samantha, who first sparked rumours they were romantically involved last year, are rarely seen without each other.

The pair were photographed holding hands and laughing on the set of Lindsay's new movie 'Labor Pains', and were seen sharing an intimate hug and kissing during one of P. Diddy's infamous boat parties at the Cannes Film Festival in France in May.