Feeling Hungry after sex is a relatively common experience, and several factors can contribute to this increased appetite. Sexual activity can be physically demanding, particularly if it's intense or prolonged. Just like any other form of exercise, it burns calories and uses up energy. This can trigger hunger as your body signals that it needs to replenish the energy it just expended. During sex, the body releases endorphins, which are feel-good hormones that help you feel pleasure and relaxation. These endorphins may also have an impact on appetite regulation.