Well, Adult sites usually come with a theme in the domain. The domain you have is great but the only thing likely to cause difficulties while selling it would be the "Singular" teen, as to pointing to a particular "Teen".
More likely uyers would be a company or a body that deals with teen problems or issues that a teen faces all over the world. It could also serve as a great teen portal.
I would say it's worth around US $100 easily
![Smile :) :)](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)