It Was Mame, Mom (S02E18)

Charlie masquerades as a homosexual so that Eric (David Starzyk), the gay owner of an advertising agency, will continue to give Charlie more jingles to write. Charlie convinces Alan to pretend to be his gay partner and attend a party hosted by Eric. At the party, Charlie is immediately attracted to Pamela (Lucy Lawless)- who is convinced Charlie is gay even after he confesses the truth. But the pressure of trying to prove his heterosexuality to Pamela proves too much for Charlie to overcome. (Warner Bros. UK)