My preferred way to browse here is using All and blocking communities I don't want to see. That way I get exposed to new things I wouldn't seek out on my own (for example: British archaeology)
I accidentally blocked a community while trying to block a user and when I went to unblock it, I saw I had 1250 communities filtered. If I had to guess, 90% are either porn, sports, or anime.
I've got hundreds of straight porn related communities blocked which were a lot of repeating themes which could be combined in one! Sprinkled in are some about sports, furries, and anime porn. I like exploring All and blocking the communities that don't speak to me. My block list is going to be huge before long, at the rate duplicates are made.