A married man and his secretary were having a torrid affair.   One 
afternoon they couldn't contain their passion, so they rushed over 
to her place where they spent the afternoon making passionate love.  
When they were finished they fell asleep and didn't wake up till 
8 o'clock.  They got dressed quickly. 
 
Then the man told his secretary to take his shoes outside and rub 
them on the lawn.  Bewildered, she does as he asks (thinking
him pretty weird).

The man finally gets home and his wife meets him at the door.  Upset, 
she asks where he's been.  The man replies, "I cannot tell a lie.  
My secretary and I are having an affair. Today we left work early, went 
to her place, spent the afternoon making love, then fell asleep.  That's 
why I'm late."  The wife looks at him, takes notice of his shoes and 
says, "I see those grass stains on your shoes.  You've been playing 
golf again, haven't you?"