My wife and I are watching Who Wants To Be A Millionaire while we were in bed. I turned to her and said, 'Do you want to have sex?'
'No,' she answered.
I then said, 'Is that your final answer?'
She didn't even look at me this time, simply saying 'Yes.'
So I said, 'Then I'd like to phone a friend.'

And that's when the fight started...  

I'm sitting at the bar drinking with my brother.

He turns to me and says "Have you ever had sex with my wife?"

I was able to answer honestly "No, never"

He says "You should, she's better than yours."

And thats when the fight started.