That's canon

Jokes aside, not swallowing would be unthinkable in the context of Arrakis.

EDIT: The horror!

"I'm not some kind of pervert."

-Frank "Beefswelling" Herbert

If it was anybody else I would assume this was a fake quote.

as childish as this type of thing is, the book makes it clear just how every bit of water has to be collected and not wasted.

Have you read the later books? That would be fairly mild.

Its not gay if we're on Arrakis.

But does it recycle the poop?