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In the middle of Yahoo's Tumblr takeover, the blogging service's dedicated users were terrified that the corporate stiffs would insert ads into their dashboard and place restrictions on the massive amounts of porn posted every day. Well, all inevitable things will come to pass, and today is porn's day.

Oh, did the users screech and holler when Marissa Mayer's purple people-eater bought Tumblr for $1 billion about how she was going to take away their nudie pictures forever. Ads were swiftly thrown into the Tumblr dashboard and now, a few months later, the crackdown on Tumblr porn has begun. "Tumblr welcomes free expression, but we have to be sensitive to the millions of readers and bloggers from different locations, cultures, and backgrounds with different points of view concerning mature/adult-oriented NSFW content," the Tumblr team says on a page explaining the new guidelines that appeared today. "There are a lot of people in our community who would rather not see adult-oriented stuff and could even get in trouble if they did!"

There are now two different classifications for blogs containing boobs and butts:

NSFW ﻿ blogs contain ﻿occasional ﻿ nudity or mature/adult-oriented content.

﻿ blogs contain ﻿ nudity or mature/adult-oriented content. ﻿Adult﻿ blogs contain substantial ﻿nudity or mature/adult-oriented content.

The new system is easy enough to understand. If your blog is the all-butts-all-the-time type, then you fall under the "adult" label. If you post some penis every once in a while in between your steady diet of One Direction GIFS, then you fall under the "NSFW" label.