In the fourth season, Dr. Katz reveals he was involved with another woman with the same first name - Sharon Meyers.
Dr. Katz: (about Sharon Koppleman) Like many of her ilk, she believes in drinking a glass of your own urine every day because it contains antibodies that will help your body fight off disease. There is some kind of medical substantiation to that theory. You know, but, uh, of course there's a down side.
Stanley: Which is?
Dr. Katz: Pee-pee breath.
Dr. Katz: I had a girlfriend in college named 'Sharon Koppleman,' who, she just, she would play my body like an accordion.
Stanley: Oooh, I usually hate accordion music but I think I'd make an exception.
Dr. Katz: She was the only woman who could get me to hit the E above middle C.
Dr. Katz: Do you have a listing for a 'Sharon Koppleman?' That's K like Koppleman, O like Oppelman, P like Poppelman, P like Poppelman, L like Loppelman.
Operator: Um, no, I'm sorry sir; there's no one here under that listing.
Dr. Katz: What do you have?
Operator: I've got a 'Rita Koonts'.
Dr. Katz: Okay, I'll take that.
Laura: (expressing her hatred for folk music) It's too trilly; why do they do that?
Dr. Katz: Yeah, that was considered at the time, intense -- that very fast vibrato. What we now consider annoying, they used to call intense.
Dr. Katz: We used to have this very cute little way of introducing ourselves. We would say to the audience: I'd go, 'She's Koppleman'; and she'd go, 'He's Katz'; and then she'd say, 'I'm Koppleman'; and I'd say, 'I'm Katz'; 'We're Koppleman and Katz, that's that's.
Dr. Katz: We played the guitar –acoustic guitar – but we did the whole circuit, we were good. We'd do the folk clubs; we did demonstrations, uh, sit-ins.
Ben: Just tell me one thing, Dad, you guys didn't snap instead of clap, did you? 'Cause I hate that.
(looking at an old photograph)
Dr. Katz: She was my partner and she was ... she was my partner in life. She was my old lady, as they used to say in those days.
Ben: What do you mean -- what do you mean by that?
Dr. Katz: We were into some very heavy stuff. For three-and-a-half years, she was my, my main squeeze -- we were lovers.
Ben: You were lovers? Isn't there another word for that that wouldn't make me so nauseas?