Question

Why do your lips touch when you say separate but they don’t when you say touch

Answer 1

Answer:

This is because the corners of the lips touch to make the sound of "ch." Just because it's not full contact doesn't mean that somehow the lips don't touch.

Anyways that is a funny joke.

Answer 2

Because of the sound you make with the “to” and when you say separate you say sss like an snake