That's not their quality control you are referring to but the content guidelines (censor). It's a choice they are free to make, and are probably mostly copied off some American idea on what should be public or not.

The problem you are running in to is that your ideas don't match their ideas and you want them to match your ideas (which they won't because they don't live in your world, they live in their world, which at this time is mostly the USA world).

If in your country the government would enforce some law stating that companies should not block sex in their content pipelines, then Apple, just like they do in every other country, will comply. This is also the reason they censor stuff in China, it's the law over there.

So while their ideas and values might not match with you, they do still have to follow the law. If you believe companies with a large impact should not block certain information from flowing, that is something you can enforce by law.

A company has to deal with the law, and cannot go and be an anarchist whenever it feels like it (but people can) because then they cease to exist.

> The problem is that on iOS Apple's "quality control" includes banning normal and fun human activities such as sex.

While being totally OK with (gun) violence. Hello, double (American) standard. Keep that double standard in the US. I don't want it in the EU. Thank you.

There are multiple ways and levels. The easiest is gatekeeper, which lives in the security settings. Next is SIP, which is a deeper layer (also PKI based) which cannot be changed while booted (which is a very good security model). You can only change this preboot or in the recovery environment. At that point, you may choose to disable SIP completely, or just parts of it (done using the csrutil). For an easier preboot option, you can use something like rEFInd/rEFIt to do this whenever you feel like it from a small preboot application.

Security-wise, that can be problematic, and I suggest you turn on EFI password authentication so it's not something everyone can do to your machine. This means you can still change the SIP settings on-demand per boot using a USB stick with rEFInd on it, but doing that requires you to chain boot off of that USB drive and doing that triggers EFI protection and requires a password before you can do that. Normal boot would not require a password and lets you use the system as-is.

Google for macOS gatekeeper