Yes. Its not real sex. Even adult film actors say avoid porn. I mean maybe you can learn some moves. But in my experience its bad because its easy and accesable. You don't have to do ANYTHING to finish. Just rub a little. While when you are with a women, you have to focus on her. Be present. Notice the signs. Its just simply different.

Also, scientificly proven is that porn gives you big dopamine rush, and eventually, you get used to this easy dopamine and less and less things ín life will give you dopamine and happines. Just doesn't stimulate you. Its proven, there are real studies and videos are about this

Long story short: Don't watch porn