Pretty sure we are the only animals with pink rings around our mouth. It’s flipping weird.
It probably helps with verbal language understanding as humans often use mouth movements to interpret words (see McGurk effect). But I still think it’s weird.
Big pink rings.
Fun fact: when two people kiss, they create a long tube that starts and ends with an anus.
Giggity
So you could also extend that tube woth a third person?
Plot for human centipede right here.
How do they think of these things? Just like this, with a bong.
Ever performed a double butt kiss?
Why, you offering?