SWM024: Why Do Men Think Sex is a Reward?

Often men see sex as a reward, even when it's not intended for one.  Conversely, if they don't have sex, sometimes they feel punished, or that they failed at something.  Why is this?  I think there are three reasons: Hormones - specifically dopamine, the "reward" hormone. Society - We're taught that sex = winning Sex is a big part of being male