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When two people kiss, they form a long tube from one anus to the other
(self.showerthoughts)
A "Showerthought" is a simple term used to describe the thoughts that pop into your head while you're doing everyday things like taking a shower, driving, or just daydreaming. A showerthought should offer a unique perspective on an ordinary part of life.
What about when two human-centipedes kiss?
If one human centipede kisses its own ass it'll be an infinite loop.
It becomes a torus.