DALLAS—Marilyn Monroe, Glenn Ford and a plaid couch where the Hollywood stars supposedly ended up one night.

Use your imagination to fill in the rest, says a Dallas auction house.

The couch and its rumored steamy back story is the centerpiece of an October auction of personal items owned by Ford, who entertained more than one starlet on the sofa in his Hollywood home, according to his son.

Heritage Auction Galleries expects the 8-foot couch to fetch more than $3,500 next month.

“How can I say this discreetly?” Peter Ford said. “That couch had been an item of passion, shall we say, in my father’s life. Not just with Marilyn but a few others.”

Glenn Ford mostly portrayed handsomely strong, thoughtful protagonists in westerns and romances over his 53-year career. He died in 2006 and is best remembered for “The Blackboard Jungle” and “Gilda.”

Peter Ford said his father met Monroe at the Golden Globes in 1960, when he presented her with the “Best Actress” award for “Some Like it Hot.”

About a year later, Peter Ford said Monroe and his dad went to his home and made love on the couch, a tryst Glenn Ford allegedly memorialized on the back of a painting that hung near the sofa.

Glenn Ford allegedly wrote, “She said “Just hold me’ and I did—and more.”

He went on to write: “I think Marilyn wanted to die. When we made love she whispered ’I wish I could die right now, while I’m happy.”’

Peter Ford, who is writing a biography about his father’s life, said he is selling the couch and other items because his family is planning to move out of his father’s 9,000-square-foot mansion.

An e-mail seeking comment from Marilyn Monroe LLC, the icon’s estate, was not immediately returned.

The auction is Oct. 4-6.