When Porn MD loads, you might be rather confused since it looks like a very plain page. Don't let that put you off, since Porn MD is actually a search engine for porn! Similar in style to Google (but not affiliated in any way), You will see a search box where you can type in any type of porn you are looking for.
You can select between straight, gay and shemale too and once you've done all of that, click search and all listings matching your search will load. This page is pretty useful as you can filter your results by length, quality, date added and source.
If you click on any of the image thumbnails, your chosen movie loads from an external site. The movies are all a decent length and quality, and one feature that's useful is at the top of your search results, related searches are displayed. Overall, a damn good site!