Running
Running is a great and fool proof way to release pent up energy, stress and excess adrenaline which all contribute to stress. We already know how stress can be the ultimate sex killer. When you run, you will also release endorphins, which is the feel good hormone. When you feel good, this will translate to all areas of your life which might make you more attentive to your spouse and her/his lovemaking needs which ultimately ups the ante in the passion department.