A hillbilly send his virgin 18 year old son to the local "cat" house to learn about sex. He gives him five bucks to spend.
The kid enters the house, meets the madam and says "Daddy sent me here to get a sex lesson." The madam asks how much money he has, and the kids says "Five bucks...." so she says "Gimme three bucks, and go up the stairs, and go in the door on the right."
So the kid does, and enters the room. The lady there says "Hi, whatcha lookin' for kiddo?"
The kid says "Daddy sent me here to get a sex lesson. I've never even seen a lady nekkid." She says "how much money you got?"
"I got two bucks left" he says. She says, "Well, for two bucks lets do some 69." He says "OK, I'd like to learn that."
So, the kid strips, lays on his back, the lady strips and reverses on top of him, and they go at it. Suddenly, the lady's backside erupts
"PBHHTHTTPPBBTT!" with an awful stench.......
"OMIGOD!"
yells the kid, shaking his head violently.....and the lady says "Honey, I'm so sorry, that won't happen again. lets keep going."
So they start again. And a minute later "PBHHTHTTPPBBTT!" again!!!
The kids eyes start watering, he shakes his head madly and says "Damnation, lady!!!"
She says "Please, it must have been something I ate. I promise it won't happen again....lets continue."
The kid says "If you think I'm doing that 67 more times you're nuts!!"