"At first, I cheated on my husband because I wanted to make him jealous. But without realizing it, I became addicted (bitter smile)." said Mai Hirahara, a 37-year-old housewife who has been married for 12 years. She said that her soft married life was becoming boring, so she tried to test her husband's love for her. "I purposely leave signs of cheating to make him jealous, and then punish him with sex, which really makes me feel good ......."