Doonesbury by Garry Trudeau for September 07, 1993
Transcript:
Mark: I just don't understand why this happened to me so late. Why did Andy visit me now? Mike: Andy didn't visit you, Mark. Andy doesn't exist. You visited yourself. Maybe on some level, you finally felt ready to face your true nature. Mark: But I don't feel at all ready to think of myself as gay! Mike: But you're not only gay. It's just one more thing about you. Just add it to the list. Mark: A nearsighted, middle-aged, loudmouthed, radical, gay D.J.? Mike: Welcome in many homes, I'm sure.
It happen because Trudeau felt he had to add a gay character but a bi one would have been more interesting.