The hulking farm boy had just got out of high school and thought it was about time he went to town and sampled the night life. 

He went into a bar and drank his first beer, then he tried some hard liquor. 

He was feeling good so he asked the bartender  what else do farm boys do with a night on the town?

The bartender says most go to the cat house at the edge of town and explanes that for a few dollars he can have sex with a girl there. 

The farm boy thinks that will surely be the best ending to his evening, so he goes to the cat house and selects a pretty young gal and they go to her room. 

He is inexperenced but she is patient with him and as they reach the climax of the action, the farm boy jumps up, pulls on his jeans, grabs his boots and runs out.

She hollers,"What's wrong?"

He hollers back, "I didnt like that, it curdled my urine."