The famous site Rule34 is of course based on the Internet rule 34. I don't think I need to introduce it, but in case some of you don't know it, the Internet rule 34 states that every "thing" on the Internet has a pornographic version.
Indeed, on the Internet all the fetishes flourish, and you will be undoubtedly very happy to learn that the site rule34 gathers them all. You just have to type "feet" or "big breasts" on the search bar to find your happiness. However, you should know that it is better to enter your search in English for better results. So think about doing a little tour on Google Translate to have fun on Rule34.us.