Hey so I'm starting out here and I want to start posting a comic. But I got to the rating part. And there's not real gratuitous disgusting vivid violence or sexual content that goes into my comic, but the main character has quite the mouth. In fact I've had to get creative with some of the curses he uses. 
So what does that put me at? Also whats the difference between adult and mature?  

Adult is usually for the most extreme stuff- pornographic content, really graphic violence, etc. I dont' think profanity alone would rate an A. It might help if you compare them to movie ratings, if your comic is like an "R" movie then it's probably an M here.: ]