18Comix is a minimalist hub of X-rated comics and cartoon productions. The site functions in a blog-style format with the latest updates shown on the homepage in chronological order. As things currently stand, 18Comix.com releases new material on a regular basis - many multiple daily updates are currently available across a wide array of different comics. Additionally, you'll find a mobile-optimized site which is perfect for those that aren't on a desktop computer.
18Comix.com doesn't appear to have any exclusive material and instead archives the material of others. There is hentai-style material here, but Western comics definitely appear to be the more popular medium of choice.
After clicking on a comic that you like the look of, you'll be transported to a page where you can download the material. Note that all of 18Comix.com's content is stored on third-party sharing platforms. You can download a few for free, but if you want to get the whole productions, chances are you'll need to get yourself an account on one of the file sharing networks they use.