Is 'a guy like you sex fanfiction' appropriate for all audiences?
Definitely not. Since the title mentions'sex', it gives an indication that it likely contains sexual or adult - oriented content. Such content is not appropriate for a wide range of audiences including children, people who are not interested in sexualized literature, and in general public settings like schools or libraries.
No. Fanfiction that involves sexual content is not suitable for all audiences, especially minors. It may contain adult - themed elements that are not appropriate in a general or family - friendly context.
Well, it depends on how one defines 'appropriate'. In a public or general reading sense, it's likely not appropriate as it has'sex' in the title which implies it may have sexual content. However, in an adult - only or specific niche community that is okay with sexual fanfiction, it might be considered within the norms of that group. But overall, in a broad society, it's not something that should be freely accessible to everyone.