Ok, that's weird that twink porn will still pop up, even though you unchecked that category.
It works with the shemale category though. I unchecked it, tried to search for shemale porn (for experimental purpose) and it gives me no results. When I check the shemale category and search for shemale porn, then I do get results.
So I don't really understand why it doesn't work with other categories too.
That's a bummer for you 😕