Quora: What kinds of topics do you follow/block?

I've stopped using Quora recently because of sooo many sex stories that floods my news feed. I stopped following topics such as Everyday Life, Psychology, Stories, etc. but they still keep coming from other "similar" topics.

There was this question and answer about a business theory when all of a sudden a sex story came up. I hate it when users of Quora do that just to gain upvotes... It was a GOOD story too..

So anyone suggests better topics to follow? Or what topics do you block to more of avoid PM? Or should I just ditch Quora altogether?