An architect, an artist and an engineer were discussing whether it was

better to spend time with the wife or a mistress.

The architect said he enjoyed time with his wife, building a solid

foundation for an enduring relationship.

The artist said he enjoyed time with his mistress, because of the

passion and mystery he found there.

The engineer said, "I like both."

"Both?"

Engineer: "Yeah. If you have a wife and a mistress, they will each

assume you are spending time with the other woman, and you can go to the

lab and get some work done."