The reason I call pornography the subtle sin is because it can happen anywhere and everywhere unbeknown to most of us... even sometime to the one it's happening to. It's not your fault that if you walk down the street and you see someone half dresser or indecently exposed/dressed but it is your fault how you respond to it. When the spirit of lust over comes a man/woman they have a tendency to respond to most things that most of us would shun. I remember an ad of the little Coppertone girl: where they showed her tan mark on her buttock. The ad was an innocent ad to most but if the spirit of lust is in a man, he will see that ad differently; so, when you catch yourself viewing something more than you should or gazing at something longer than you should: suspect that there may be something inside that's helping you and provoking you to do these things. Even the rapist who raped someone was provoked to do what he did. It may have been a long time coming but when that Spirit of lust overcomes him, he has a tendency to do things that he wouldn't normally do. He's not any less of a man than any of the rest of us; it's just he had help! Beware my friend what you let come into your spirit: of what you see, what you read and what you hear! Because those things may bring you hurt and even keep you out of heaven.