A man is having an affair with his wife and decides to stay round his new found lovers house for the night.  They decide to have an all nighter.

In the morning the lover decides to ask the man how is he going to explain his absence.  He tells her to go outside and rub his shoes on the grass.  The woman does it, but is confused.

When he goes back to his own house, the wife asks “Where have you been?”

The man replies “I’m sorry but I’m having an affair with you.”

The woman looks down at his shoes and says, “You liar, you’ve been out playing golf all night!”