Anything that the wife doesn't like to participate in that gets you out of the house. Fishing comes to mind, but then I remembered this story:
A Fishing Caution:
Saturday morning I got up early, put on my long johns, dressed quietly, made my lunch, grabbed the dog, slipped quietly into the garage to hook the boat up to the truck, and proceeded to back out into a torrential downpour. There was snow mixed with the rain, and the wind was blowing
50 mph.
I pulled back into the garage, turned on the radio, and discovered that the weather would be bad throughout the day. I went back into the house, quietly undressed, and slipped back into bed. There I cuddled up to my wife's back, now with a different anticipation, and whispered, "The weather out there is terrible."
She sleepily replied, "Can you believe my stupid husband is out fishing in that?"
I guy I know told me a story about a guy he knew who was cheating on his wife. Every time he went off on a fishing trip, he was really shacking up with his mistress in a motel. Meanwhile, the wife had her lover buy the same kind of car as the husband, so the neighbors wouldn't notice it parked in the driveway while the husband was off "fishing".
As the old song says "Who's makin' love you your old lady, while you are out makin' love?"