So, in a low number of words, I can say that it works like a Google made for hentai entertainment. It's a search engine where you will have to insert your keywords in order to get results that have what you are looking for. Come on, I don't have to keep on explaining, since you already know how these engines work, mainstream or porn. You are a real web trooper!
A full list of tags can be found in the header and if you will click there, you will see popular terms. They are all sorted in an alphabetical order and this way, it will be easier for you to do your thing. I don't really like the fact that they have some ads that will popup in your way when you will do clicks, but it isn't the end of the world. It's decent, in comparison to other places I've seen!
I went for a test drive and I searched for "fetish". To be honest, I haven't been disappointed at all. I got exactly what I needed and the results (several columns) were shown very fast! Click on the screenshot! You can bookmark this place for a later use!