A Pom and an Aussie were having a (warm) beer together, discussing what good friends they were.

The Pom said to the Aussie "If you were away on business, and I was to come to your house, and me and your missus were to get it on, do you think we'd still be friends?"

The Aussie was silent for a moment.

"Well I don't know if we'd still be friends..." the Aussie finally replied.

"But we'd be even."

...as silly as a bum full of Smarties.