It is very bad for a man to have an affair. First of all, their families will be discordant because of extramarital affairs, and there will often be contradictions and quarrels, which will lead to men's distracted attention at work, reduced work performance and efficiency, and stagnant careers; Secondly, people's emotions and moods will be influenced by things around them. Cheating will make them feel negative and even have no enthusiasm for their work.