A young cowboy gets hired at a remote Texas ranch. While the ranch foreman 
shows him around the desolate place, he asks, "What do you do for, uh, *female*
 companionship?" The foreman points to a large wooden rainbarrel out behind 
the bunkhouse and says, "When we get horny, we use the barrel."
 
 Well, the young cowboy had just put a long, dusty ride behind him, so he 
decided to try the barrel immediately. He inspected it and found that
it had a well-worn knothole about midway up the side of it. He tried it,
and by golly it wasn't half bad. After he finished, he went back to the  
foreman and said, "That was pretty good!" "Good," said the foreman,
"glad you liked it. You can use it anytime you want, any day but Thursday."

"Why not on Thursday?" the young cowboy asked. 

"Because that's *your* day in the barrel."