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Just answer the question. Guess it depends on where they are joined. If they're joined at the back of the heads, guess one couldn't see what the other one is doing.... Also, could a mother give birth to Siamese twins the natural way? That's alot coming through such a small opening all at once.
Heard it feels like this: Take the pointer finger and thumb on both hands, grab your upper lip and pull it kind of hard toward your nose. O.K. Then pull your lip over the top of your head.