Three "Excuses" for people to lie to themselves.
1. I cannot help myself. I have to look at porno because my wife, husband does not satisfy me. I cannot help it because it is everywhere. I cannot stop myself from looking, after all, they send me email, and I cannot stop myself from opening it. The list could go on and on but the truth is we tell ourselves a lie in order to justify our behavior.
2. It is good for me. I cannot help myself.
3. No one will know. When we tell our self that no one will ever find out what I do late at night while my spouse is asleep. What they don't know can't hurt them.