For many men, fertility is something that comes to mind only after trying to start a family. Until then, it often feels like an issue that can be safely ignored. But doctors say that assumption may be costing many couples precious time.Unlike a sudden illness, fertility rarely changes overnight. It is shaped gradually by everyday decisions, how long someone sits, how much sleep they get, whether stress is managed, what they eat, and even where they keep their laptop while working. These habits m