“Tonight again, Mahiro turns her back on me and looks at her phone.” We met as supervisor and subordinate at work and have now been married for five ordinary but happy years. Then she suddenly began using her phone in bed, claiming she was only searching for a shop. I trusted her until the bright screen caught my attention and I looked over her shoulder. On it were graphic messages with a strange man. My wife was cheating on me—and to my shame, the discovery stirred not anger but an excitement unlike anything I had ever felt.