A Perl programmer calls in sick one day. His boss gets on the phone and tells him: "Listen son, we've got a launch going today, you have to come in. Take my advice - when I feel a cold coming on, I ask my wife to 'do it' with me. Afterwards I feel great."
Two hours later the programmer shows up at the office: "You were right, boss, I feel great! By the way, nice house you've got there...."