Tumblr's Most Popluar Bloggers Have An Affinity For Publishing Adult Content

yeah, 16/20 of the top blogs on tumblr are adult oriented. so I think it is definitely because of the traffic

Oh, heaven forbid that a company might promote something that's adult.

Frankly, I'd LOVE if tumblr did that. More companies should. The internet should not have to be as prudish and restrictive as the rest of, well, everything.

I think the differentiating point is that Tumblr is not an adult website. Adult websites need to stay separate from those which are popular for kids <18 years old or at least have some kind of warning that informs the user about the content. We have the same thing for TV, music, movies, video, and video games too.

I think the majority of people, if they bothered to think about it, would be surprised to see a popular online service which didn't have porn.