It frustrates me to see Christians and Pornographers agree on a complete lie. Sexual arousal is not LUST. It’s just desire. If I see a good looking woman and get a woody, I have not lusted. The only way for me to lust is if I make plans (or wish that I could make plans ) to get in her pants.
The comedian Bill Burr does a great job with this on one of his Netflix specials. He talks about how Tiger Wood and Arnold Schwarzenegger were attacked because they cheated on their wives. He makes it clear that the difference between Tiger and Arnold and the men attacking them was access. Many of the men attacking them would be committing adultery also if any woman wanted them. I agree.
Just because you haven’t committed adultery doesn’t mean that you haven’t lusted. If you want to commit adultery, if you make plans to have sex with other women – or if you WOULD make plans if you didn’t know that you would get caught – then you are lusting.
But the mere fact of physical arousal at the sight of a woman is not lust. Looking at Sports Illustrated Swimsuit addition is not lust, even if you get hard. Watching Daenarys Stormborn and liking her breasts (hubba, hubba, they are really great!) is not lust
The error of equating arousal and lust is an old heresy called “Cartesian mind-body dualism.” (Wikipedia link here) It is the belief that God is in the realm of the spirit and sin is in the realm of the flesh or body. This is a heresy that all mainstream Christian leaders know to avoid, yet for some reason, when it comes to physical arousal, they forget all of their Seminary lessons. (Maybe because they are thinking with their balls instead of their brains).