This might be old news but I believe the orgins of the story have been sorted out. The page listed below has a discussion of the origin to the legend along with an MPEG of the actual show (The Newlywed Game, 1977) with the phrase “in my ass” bleeped. The couple looks middle eastern to me and that may explain the start of the racial shift and eventual language the final story has. Finally after three years of worrying Uncle Cecil might be testing us I can rest easier…
(choose Radio & Television, Television Legends, and scroll down to The Newlywed Game). The following is mid page with the MPEG at the bottom
"Recently a Newlywed Game clip (from a Game Show Network rebroadcast of the show) has come to light that may or may not be the origin of this legend. In a 1977 “Maternity Day” episode, Hank Perez guessed that his wife Olga would say the strangest place she’d ever had the urge to make whoopee was in their car on the freeway. When the wives were brought in to provide their answers to the same question, here is what transpired:
Bob: Here’s the last of our five-point questions. Girls, tell me where, specifically, is the weeeeeiirdest place that you personally, girls, have ever gotten the urge the make whoopee. The weirdest place. Olga?
Olga: Umm . . . (audience laughter)
[pause]
Bob: Yes, Olga?
Olga: Uh . . .
Henry: Go ahead.
Bob: Yes, Olga.
Olga: I’m trying to think. Umm . . . [Turns to husband.] Gee Henry, what did you say?
Bob: Hey, don’t ask him. He can’t help you out at all.
Olga: Is it in the ass? [Last three words bleeped]
Bob: No no no . . . no . . . what I’m talking about is the weirdest location, the weirdest place . . .
Olga: The weirdest location. I don’t know. [Laughs]
Hank: [Laughs uproariously] "