Three's Company (1977)

S2E4 Strange Bedfellows

Title: Unlikely Companions Plot: Chrissy and Janet head out for a getaway, leaving Jack with a promise to avoid throwing any parties. However, as soon as they leave, Jack breaks his promise and hosts a gathering. Mr. Roper arrives to shut down the festivities but unexpectedly gets swept up in the fun. The next morning, he finds himself in bed with Jack, leading him to mistakenly believe he is gay.