Two in one combo

When two men are giving backshots to a girl going 400 mph.

“Man, those men really hire me with the two in one combo.”

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.

Two for one deal-do

When your wife gives you a prostate massage with a sausage and feeds it to you afterwards.

My wife asked me if I wanted a prostate massage with this huge slim Jim and when I’m finished she would feed it to me. It’s a two for one deal-do