Even though I choose to view the Gay site, I still see straight and trans porn in my search results and recommendations because of how users tag and title their videos. As a result I see a lot of video content that I have no interest in and would like to see a keyword filter that persists site-wide to finely tune the content that I see. Tumblr and Instagram offer this and it helps to create a much more personalised experience and makes the content I see much more relevant to my interests.