who done the dirty deed

Whenever you ask a pregnant woman who is the father of her baby

James: Yo Mary, I see you're pregnant who done the dirty deed then?

Mary: Oh it was Mark

Fill two needs with one deed

To achieve two simultaneous goals with a single action.

A less violent alternative to the phrase 'to kill two birds with one stone'.

I needed to post a letter and buy some bread, so I though I'd fill two needs with one deed and stop at the mailbox on the way to the store.