SAFF is a large porn forum that deals in a huge number of different niches. Instead of a lot of sites that only bother to focus on a few niches, this place is all about showcasing and exploring every simple niche you could imagine. SAFF.cc knows the drill when it comes to good porn forum management and has actually been doing it for quite a few years.
Everything from your classic standard niches such as lesbians and public porn are provided with some pretty extreme stuff such as male domination, scat porn and more come together at SAFF. Each niche has its own special area on the site too, so if you just want to focus on a single particular type of content, you can do that easily.
The only downside I can find to this place is that there appears to be some recent issues with the site staying online. They've added a few more ads and asked for donations, so hopefully in the not too distant future, that's no longer a problem.