Why is adultery fun?

When we are engaged in illicit activity the brain kicks out endorphins & Hormones as strong as Heroin. That makes doing the naughty things incredibly addictive. Very often the Adultery that turns into a relationship & ruins a marriage falls apart fast and hard because once it isn't illicit & the "high" is gone we see that it really wasn't that great. People who become addicted to that Adultery high often go from botched relationship to the next & don't find real happiness.