In my humble opinion, movies are already a challenge for "normal" people, let alone us GYErs. It's very hard to find a movie or show nowadays which doesn't portray immodestly dressed women, or worse.
If you wanna be succesful, you wanna make the journey as easy as possible, and a movie, while a "fun" distraction, can make the journey a lot more difficult.
Several members here have had great results by cutting on movies.
For me at least, the less I feed the addiction, the easier it is for me. The more I lust, the harder it is to control myself.
Also it's not uncommon for one to be aroused by a movie and seek more forbidden material. Sort of like a "gateway drug". I know when I was 300+ days clean, I'd watch movies, but would turn away at the slightest cleavage or bad sight. Although I have to admit, I was playing with fire.
You say you can't stop, I get it, you need something to relax. Have you tried other kosher hobbies? I think people have a list of them in the forum.