Answer:
Well I figured I needed to answer this to avoid anybody with a dirty mind getting the wrong idea here.... (; In my expert opinion the tongue is a tupe like mouth part. Especially when you roll it in "hot dog" formation. I drink my sodas like that. This is also true that zebra's do this in their mating ritual. So don't be doing this at the zoo if you know what I'm saying. -nudge nudge- THANKS FOR ASKING SUCH A FABULOUS QUESTION. Hope my advice helps.
Stay beautiful.