Questions that bother me #1: Why does Siri not find anything about "anal sex"?

Well. Don't ask why this question came up first for this category I will do from time to time. In short: There was a teamspeak conversation, there were questions and they were asked.

So this was - once again - a question that bothered me.

WHY DO YOU LIE, SIRI?

As my friend asked Siri the simple question "Was ist Analverkehr" ("What is anal sex?") she claimed that she "couldn't find anything about anal sex on the internet". Hands-down guys we all know that she's obviously lying.
So after we laughed about this shameless lie from our future-best-buddy I sat there and asked myself: What the hell is this? They really censor anal sex?

In Germany we teach everybody, especially kids, about sexuality. And yes we talk about anal sex in that case, too.
The first hit on google with that question leads to various articles describing - to be honest - details I didn't want to read.

So the question I'd like to ask: Why does anybody come to the idea to censorship an obviously total common thing or practice? Is it the fear that everybody will have anal sex in front of the apple headquarters? What's the motivation behind this?

And the relevant part: Is it acceptable for a free and educated society to censhorship ANYthing that is true, scientifically proved, known or accepted by the majority?

Would love to read some opinions especially from overseas!

Greetings
Julius