I doubt it. I stopped using Tumblr around the time they removed adult content; not because I was there for porn, but because it just seemed so restrictive and I knew there would be chilling effects. You have to look over your shoulder with everything you post, and that's just not a nice place to be in when you want to get creative juices flowing or just reblog things for hours.
Bring back 'adult content' and I'll gladly check out Tumblr again.