Yeah, you don't get it. In ME1 there was partial nudity during the romance scenes before Ilos. It was not explicit but it was also not bashful. It was obvious that Bioware wanted nudity in the game to an extent. Between ME1 and ME2, there were complaints from people that never experienced the game for themselves about a Mature rated title that depicted obscured, naked, female bodies. In ME2 it was obvious that Bioware had backed down a bit with the depiction of nudity. In ME3, we got a bit of a mixed bag with Liara appearing naked during her sex scene. Makes sense, she's about to engage in a sexual relationship. However, we also got the goofy Traynor shower scene. No one in here is talking about making Mass Effect a game where every romance scene has full nudity (though I really wouldn't mind it). I don't get why people keep suggesting that's what we are arguing for. We are talking about doing it right if you are going to do it. No, not every intimate relationship deems nudity in the game, yet there are moments where it just makes sense.
My goodness. Wrong. Wrong, wrong, wrong, wrong, wrong.
You've completely failed to grasp the notion of what 'makes sense' to exist is entirely irrelevant. What's actually relevant is what the storyteller wishes to show.
Consider the film The Shawshank Redemption. A masterpiece. In the film, as you may or may not know, the main character is raped in prison multiple times.
It isn't shown, however. It happens offscreen, but the narrator makes it very clear it does happen.
So let's talk about your 'argument.' Why is the viewer not shown a graphic scene of the protagonist being gang raped? This is a mature film. The audience can handle it. Why did the storytellers '***** out'? Why didn't they 'do it right?'
Does it 'make sense' for this graphic rape to exist? Oh yes.
Is the audience too immature to handle it? Nope. This film has plenty of mature content.
And yet, despite that, it wasn't shown. Both of the filmsy 'conditions' you laid out were fulfilled. So clearly, either one of two things were true. The storyteller was incompetent, or they had another reason for not showing it.