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
You really gotta give Herbert for towing right up to the line for incest, giving it a little kiss, but not crossing it.
You really ought to just read the books, but it’s a LOT of “technically not incest” throughout the series. From the Bene Gesserit breeding programs, to Paul considering using his sister to make an heir, to Leto II’s interest in his sister despite being unable to have sex, and then his breeding programs with the Duncan Idaho gholas. Nothing you can really call incest actually happens, but it’s definitely uncomfortable at times.
In the next movie we might get to see Anya taylor joy fighting some training robots naked and paul getting hot and bothered by it.
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.