It appears Google’s Friend Connect/Blog follower feature allows users to fly topless pictures.  Add this to a mix of high volume “social”-enabled blogs and hilarity (and traffic) ensues.

Here’s an example from a fairly popular blog:

The racy profile pic will appear first under the Google Friend Connect/Follower area.  Click Here.

When you click the profile, you get link outs outside of the Google network.  Click Here.

Some issues that come to mind:
Untargeted traffic usually don’t convert well.  However, assuming the right mix of blogs are tagged, a heavy volume would offset the lack of targeting.
Age-sensitivity issues for Google.  This widget could very well appear on blogs visited by minors.  That won’t be a good thing for big G.  Maybe an age-filtering system for profile pics?
Scope and reach.  Just how do profile marketers know which blogs to visit so their profile pic appears?  There’s quite a lot of blog metric tools out there, along with platform information to address this issue.
The deal killer: heavy traffic blogs have a lot of user “churn”.  Sure, your click magnet profile pic might appear once but it is quickly flushed as more users visit the blog.

Other thoughts:  A better approach would probably involve posting only bikini (PG-13 type) shots instead of topless pics.  Probably would result in less banning   This would probably work for both mainstream and adult themed sites although the adult sites would probably convert better–due to thematic proximity between picture and target site.