For most of us, the classic test of willpower is resisting temptation, whether the temptress is a doughnut, a cigarette, a clearance sale, or a one-night stand. When people say, "I have no willpower," what they usually mean is, "I have trouble saying no when my mouth, stomach, heart, or (fill in your anatomical part) wants to say yes.
Kelly McGonigal (2011). “The Willpower Instinct: How Self-Control Works, Why It Matters, and What You Can Do to Get More of It”, p.14, Penguin
