Google is reviewing all the porn blogs hosted on the Blogger accounts.
These blogs are now blocked for public access, however the autors still can login to their account.

The blogs when searched in Google will show the message as below

In Google’s Blogger Content Policy you can find following terms of condition

Commercial Pornography: We do not permit the hosting of sites that exist for the primary purpose of garnering commercial traffic through pornography. Such sites tend to take up a disproportionate amount of resources. In order to maintain a free and open service for the majority of our users, we choose to forbid commercial pornography on Blog*Spot.

The message seen when you try to access these blog is:
This blog is under review due to possible Blogger Terms of Service violations and is open to authors only.