The blog Rum, Romanism and Rebellion pulls out a 1986 Tucson Citizen article recounting a joke about rape told by Sen. John McCain (R-AZ). Speaking to the National League of Cities and Towns in Washington, DC, McCain allegedly said:
Did you hear the one about the woman who is attacked on the street by a gorilla, beaten senseless, raped repeatedly and left to die? When she finally regains consciousness and tries to speak, her doctor leans over to hear her sigh contently and to feebly ask, “Where is that marvelous ape?”
McCain was swiftly criticized by women’s groups. A spokeswoman for NOW in Arizona said the organization’s members were “incensed by his cruel and sexist remark.” McCain said he did not “recall” telling the joke. More recently, the McCain campaign scheduled a fundraiser with a Texas oilman who compared rape to the weather while running for governor. “As long as it’s inevitable, you might as well lie back and enjoy it,” said Clayton Williams in 1990. After public outcry, the event was “postponed.”
Update - Huffington Post's Sam Stein spoke to reporter Norma Coile, who wrote the original article. Coile told Stein, "I'm not sure exactly what the wording was of the joke, but something was said. Some joke involving a rape and ape was said."
The 'joke' as given makes no sense; no punchline, no funny.
I think I can identify the actual joke; Near enough,it's
There were these two little old ladies visiting the zoo. As they lingered around the gorilla cage, the biggest male of all the gorillas reached through the bars of his cage, grabbed one of the little old ladies, dragged her through the bars of his cage and began having sex with her right there in front of God and everybody!
Well, the zookeeper came and sedated the gorilla, the paramedics came and sedated the little old lady and her horrified friend, and they took the little old lady to the hospital.
The little old lady's friend was shaken and embarrassed by the incident, and she didn't know what to say, but after a couple of days finally got the courage to go see her friend in the hospital. "Are you hurt? Does it hurt?" she asked.
"Does it hurt? Am I hurt?" repeated the teary-eyed little old lady. "Goddamn yes, it hurts. It's been two days -- he doesn't write, he doesn't call!"
Which is more or less the way I happened across it first some decades ago.
What is odd, though, is that that version comes a fair way down google; the top ten or so are on racist jokes websites - that is, specialist anti-black 'white pride' type websites, or at a pinch jewish jokes.