I just love the image of a girl sucking her thumb. It has to be the thumb though. Licking her finger rather turns of off because it looks kinda cheap...
http://gallery.peachy18.com/aHR0cDovL3d3dy5uc2Z3bW9kZWxzLmNvbS9nYWxsZXJpZXMvcm9uaGFycmlzL2JyZWVfZGFuaWVscy9icmVlLmh0bWw%3d/