This isn't entirely a video-game issue. In Australia I'm pretty sure even our pornography can't display NC content. (Not that this is an issue much with the internet, but pornography actually brought out on DVD/Video over here actually has some restrictions).
From what I understand your pornography restrictions are some of the worst in the world... BDSM in any form isn't allowed, neither is "rough play" or hair pulling, only one gentle spank at a time is acceptable, calling someone a "whore" or a "slut" is out of the question and any link, however tenuous, of sex with violence isn't allowed; there was one case where a film was refused classification because it involved two people looking for a friend who was kidnapped having sex, despite the fact that kidnapping was never shown or discussed during the sex scene.
On the internet point... and you'll most likely be in a better position to answer than me... haven't there been moves to put in place an internet filiter to block all RC (Refused Classification i.e. banned i.e. the things listed above) content?
Anyway, two points on the topic:
1) What we have yet again is people kink shaming and getting upset at consensual roleplay. To repeat the point again, there's no rape in that Hotline Miami 2 scene... it's entirely consensual. I've posted before about the variety of ways that BDSM and kinky play has been targeted across the world and this is largely another example of it... people thinking it's disgusting that two (in this case pixelated characters) people would engage in something that resembles NC sex entirely consensually. The furor is in a large part completely ridiculous... people are complaining about a rape scene when there's no rape at all. There's more than a hint of the Fox News "outrage" over the "graphic" sex scenes in Mass Effect about this.
2) Let's go the other way. Let's say the Hotline Miami 2 scene wasn't clearly and openly shown to be consensual and instead was an actual rape.
One can open up every other form of media... be it books, films, art, TV series, music etc etc... and see rape discussed, mentioned and described pretty much freely. A Song of Ice and Fire describes rapes (and worse) seemingly every other chapter, 50 Shades of Grey was almost entirely NC content, Sons of Anarchy featured a graphic rape scene and I've pretty much lost track of the number of films that have featured rape... all with relatively little controversy. Yes, a rape scene (understandably) makes people feel uncomfortable... but isn't art allowed to do that?
It's especially galling to see some of the people who are most outraged about the inclusion of a rape (not that there actually was one) in a video game being the same people who say that video games are art, that they don't need to be "fun" and that we need to lift the medium to a higher level. If video games aren't just about having fun and are instead a form of art then we have to accept that they can leave us feeling shocked, offended and uncomfortable (and not just because of buggy games and exploitative DLC practices). Irréversible
features one of the most harrowing rape scenes I've ever seen as well as some shockingly realistic depictions of violence and I doubt anyone watched that because it was "fun"... yet it won awards and is generally seen as an excellent (although incredibly difficult to watch) film. Schindler's List is a dark, dark movie covering dark, dark themes which again I think anyone would struggle to consider "fun"... yet is widely (and rightfully in my view) regarded as a classic movie. Bookshelves are packed with Patricia Cornwell style gory thrillers which feature sickening murders... and they're absolutely fine.
Why are video games infantilized?