if it feels good, do it

Are you a pervert if you help an old lady across the road and it feels really, really good? Not necessarily. In a classic "it's a Monday on a holiday weekend" article, the Post reports that scientists at the National Institute of Health have found that when you do an altruistic act, there is activity in the "primitive part of the brain that usually lights up in response to food or sex."

In other words, there is a scientific as well as a moral reason to know that it does feel good to do good.