A man walked up to a farm house and knocks on the door. When a woman opened the door, the man ask if she knew how to have sex. Not amused, she slammed the door. Again, though, the man knocked, and asked the same question. Not amused, the woman screamed at him and told him to leave.

Later that evening, the woman told her husband of the incident. He said he'd stay home the following day just in case the man returned.

Sure enough, the next day the same man returned. The husband hid with his gun while his wife answered the door. When she was asked again if she knew how to have sex, she replied, "Sure, I do! Why do you ask?"

"Good," said the man at the door, "give some to your husband the next time you see him, and tell him to keep away from my wife!"