Episode 50 of "Grounded for Life"
s03e13 Part Time Lover

When the dump closes, Walt finds himself with an abundance of free time and begins hanging around the house, much to the dismay of Lily, who finds it increasingly hard to get alone-time with Brad. So she schemes to get him a date online... which turns out to be with a drag-queen. Meanwhile, Eddie finds out that his girlfriend has another boyfriend.