Let me help you. It is free and it isn't ad given. Emflix.com to watch it streaming and Empornium to DOWNLOAD it. However, I stopped watching porn a while ago, I'm just giving help.
Sure it's normal to download porn; it is healthy, fun and can make your sex life even better especialy when you look at porn with your spouse then the fun begins!
Don't be ashamed at all it is absolutely normal after all, we all have needs right?