"At first, I started cheating because I wanted my husband to be jealous. But before I knew it, I was hooked (wry smile)," says Mai Hirahara, 37, a housewife in her 12th year of marriage. She says that in the past, her overly gentle marital relationship became less exciting, and she ended up doing something to test her husband's love for her. "I intentionally left traces of my infidelity to make him jealous, and then had sex with him as punishment, and it really made me feel good..."