On the surface, it looks like sex ruins things—the dynamic changes, the energy dissipates, and the tension disappears. Sometimes the relationship lasts, but most of the time, it doesn’t. Before sex, it’s all about showing up on time and smelling nice. The sexual tension does the rest, and while it may fade, it can still be kept alive with spontaneity, unpredictability, and creativity. Those things take effort, and effort is what keeps the spark from dying.