“I’m not ready to think about marriage, so I want to break up.” That was the last call from my girlfriend of two years. The breakup was so sudden that I felt as if I had lost everything and could no longer think straight. Ai, an adult senior from my university, invited me out for drinks and said, “Guys are cute when they’re heartbroken,” before kissing me. The sudden move stunned me, and I thought I had no sex drive left—but from that day on, we kept having sex until I nearly forgot my ex.