The trouble with avoiding such movies is that you can't always know they have these scenes. I can't stomach gore, hate violence, and get very embarrassed by sex scenes, even when I'm alone. If I know they're coming (such as, I've seen the movie before), I can turn off the TV or hide my eyes. But if I don't know they're coming, I often end up with a nasty scene burned into my mind for some time, coming back to haunt me while I'm eating or falling asleep (if gory) or while I'm in church (if sexual). But I don't think it's my fault for having seen it without wanting to.
I don't understand why movies put in so much of this stuff, either. I don't understand why guys I know love movies full of what is to me very boring violence, hard to follow with my eyes. I don't know why people want to watch movies about zombies eating people or slashers ripping people apart. I love the vampire genre but rarely watch/read vampire stories, because of the gore put in so many movies. A Christian friend called me a prude; I really don't get it, or why he'd keep trying to get me to watch violent or gory movies.
I once was engaged to a guy who claimed to be a Christian, who wanted to be a movie actor, but he told me that he'd probably have to do sex scenes to get anywhere in the industry. He didn't understand why I found this morally repugnant.
If I enjoy "Pulp Fiction" for the stories but hate the profanity or violence, is it sinful to watch it? I don't think so, but it's only my opinion....