A Serious Question About Lust

"Ray, I have a serious question that I am not sure how to answer when asked. When I talk to teens and tell them that if they lust after a woman/man, they've committed adultery in their heart, I've had some tell me, 'I'm not married, so how can I commit adultery when adultery is sex between a married person and someone other than their spouse.' How do I answer that?"

There are certain things that we human beings define as being morally wrong. One of them is adultery. No sane person would try a...