A man and his wife are checking out of a hotel. The man notices the bill includes a $50 fee for use of the swimming pool. He tells the hotel clerk they didn't use the pool. The clerk replies, "That's not the issue sir, it was there all the time for you to use."
"OK", says the guy and proceeds to pay the clerk $100 less than the bill.
The clerk says, "Wait a minute sir, this amount is $100 short."
"No it's not", says the guy, "I'm charging you $100 for having sex with my wife."
The clerk is shocked and says, "Sir I can assure you I did not have sex with your wife."
The man replies, "That's not the issue, she was there all the time."