Season 4, Episode 8: "The Cheever Letters"

"Yeah, I want you really bad. Just leave it on the tape."

Then, I guess, the phone company will come out with sex-waiting.

That'll be the new thing.

"Yeah, hold on, honey. I got another call.

Oh, hi, baby. One second.

Honey, I've gotta take this.

Yeah, I've got sex-waiting on the other line...

...and I've got to take this."