Granted, these tags have been cleared of porn on the app, and only contain SFW material.

However, why couldn't they do that with the "gay," "lesbian," and "bisexual" tags -- simply clear out the NSFW posts? All of the content in these tags is clearly not pornographic -- in fact, the first post in my search for "gay" on the website was just an innocent, fully-clothed selfie. And then, a few posts down, lots of porn. However, if you can apply some magical algorithm to the tag "asshole" to erase it of porn (probably by taking out any blogs marked as "Adult" blogs), what's stopping Tumblr/Yahoo! from doing the same thing with these tags?