This is a fallacious argument - not all "natural human activities" need to be portrayed in game. We don't have to stop for our characters to take a poo, and certainly wouldn't want to see it in all its 3d-rendered glory, even though it is completely natural. There is a time and place for everything, and it would be nice to handle private romantic encounters with a little more taste.
So having a sexual intercourse is as tasteful and important of a life event as taking a poo for you?
