Long Yahoo, but have a friend/Yahoo owner who expressed concerned about all the Tumblr porn talk. So, I signed on to see if this was obvious. Spent 30 minutes going through many of the blog categories, Art, Photograpy, etc, etc. Opened up many of them figuring perhaps there were nudy pic buried in them, never saw any. Also, saw no category labeled porn. Perhaps, I didn't look in the right places, but certainly this is not an obvious porn site. Perhaps, it's buried in a sub-category, gender oriented, but I'm not worried about it anymore. Fiend decided it was ok too.
Good to know I'm not the only one who didn't see porn at all.
Like a previous poster said, you have to type in specific porn-relevant search terms.
I agree, it is not an issue - never was. Seems like your Tumblr experience is what you as an individual wants it to be. If you're searching for port it's there, but if you're not looking for that experience, it doesn't hit you in the face - so to speak (~~,