Pinochle (card game)

Little Johnny got home form school early one day and couldn't find anyone.  He went to his parent's bedroom and saw them having sex. 

He asked them "What are you doing"

The parents thought fast "Playing pinochle, mom's my partner."

Johnny said ok then went to his brother's room and saw his brother and his brother's girlfriend making love and asked

"What are you doing?"

The brother said "Playing Pinochle, she's my partner."

Johnny said "OK," and left.

After a little while the family couldn't find Johnny, they walked into his room and found him masturbating furiously.  The dad asked

"Johnny WHAT ARE YOU DOING?"

"Playing Pinochle.'

"Where's your partner?"

"With a hand this good who needs a partner."