Spouses that suspect their partners of cheating, contact the show (I don't think they make them anymore...) and the show spies on them. Than they show the proof to the spouse and they go and confront the cheater. Sometimes they get really out of control. This one guy when he was confronted, naked and in bed with the girl I might add, started chasing the camera crews and his wife out the house while firing a paintball gun at them. He was already caught on tape hitting the mistress. They guy had serious issues.

The host, actually got stabbed one time during one of these confrontations.