I know that this was kind of meant to be funny, and it is, but this is a great question. If you watch way too much porn you might confuse it for the end game for sexuality. You could run the risk of confusing it for the actual satisfaction of being with another human being. Kinda how posting here all day doesn't really entirely replace human interaction.
Nah, I was actually dead serious, man. A guy made a thread here a few months back complaining about not being able to perform anymore and basically being lackadaisical when his woman came over. Turns out he was watching porn first thing in the AM. Daily. Pornography itself isn't too bad, but a lot of guys don't understand the effect it has on the mind when they overindulge with it.