The source was told the following joke by an Irishman, while he was on a family vacation in Martinique in the Caribbean. He believes it has origins in Ireland. He generally only tells this joke when he’s in a group of other men, he would only tell it in the company of women if multiple people were sharing dirty jokes.
The Blowjob Frog
A wife is out looking for an anniversary present for her husband. She’s walking by various stores looking in shop windows for something he’s really going to like, but she’s having trouble finding anything, right? But then she walks past a pet shop, and there’s a sign out front that says: ‘Blowjob Frogs, 5$’.
So she goes into the shop, and says to the guy who runs it, “Blowjob Frogs?” And he says, “Blowjob Frogs”. She asks what they do, and he tells her its pretty self explanatory, right? They give blowjobs. So she thinks its funny and that her husband will like it, so she buys it for him.
That night the husband and wife have a lovely, romantic dinner at their home. And they exchange presents. He opens his and he’s surprised. “A frog?” he asks, “A blowjob frog” she replies. They laugh, and put the frog in a box with some water so it’ll be alright until they figure out what to do with it in the morning. And they spend a passionate night together in the bedroom, best sex they’ve had in years.
She wakes up in the middle of the night, and she sees that the bed is empty, the husband’s gone, right? Then she hears the clattering of pots and pans in the kitchen. So she gets up to investigate, and when she gets into the kitchen, she finds her husband in there, with the blowjob frog on the counter.
So she says, “What are you doing in here?”
And then he says, “If I can teach this frog how to cook, your ass is outta here!”
This joke is funny on several levels. First it plays on the common husband/wife stereotypes, and implies that a man really only keeps a woman around for home cooked meals and blowjobs. Also, bestiality is definitely a major taboo, and freaks a lot of people out, so the joke allows people to discuss it. It would also make sense if the joke really does have Irish origins, because it might be more acceptable there than in America, which still tends to be fairly Puritan, and uncomfortable with sex.