What you've heard: Forego sex for a few days or even weeks so there’ll be plenty in the pipes when the woman is ovulating.
Does it work? No—in fact, it could backfire. “If a man withholds from ejaculation for more than ten days it can actually reduce sperm motility,” says Dr. Domar. Don’t hold out until ovulation day because it can be tricky determining exactly when you’re ovulating. A better idea: Have sex two or three times a week. “You don’t have to have sex the day you ovulate in order to get pregnant,” Dr. Domar says.