is also depleted by actions, but is not replenished between skills. Certain actions can raise it slightly, like some SM actions, stopping, etc, but the gain is low. When Reason falls to 0, you can keep going, however the amount of daytime stats Charm, Sweetness and Elegance lost by using each action is increased. As long as there is still 1 or more Reason, any last single action will not incur the extra stat loss, so it may be a good time to climax at very low reason as the last action before ending the night.