Because "bewbs".
Honestly, though, it doesn't matter to most of us whether it's in here or not unless there's an underlying gameplay mechanic. The fact of the matter is, if you're looking for an immersive experience that is replicates real life, people DO fornicate, and more often than not, they are not wearing much when engaged in such activity.
As far as mentioning "pixelated boobs", the phrase is so ridiculous that I had to work it into an equally ridiculous conversation. I am a filthy pervert, and you should never take anything I say at face value if I'm throwing around preposterous comparisons and metaphors. For those of us old enough to remember the days of set top cable boxes before the digital age, "pixelated boob" or "scrambled porn" pre-internet was about as good as it got apart from dirty magazines. Back in my day, you had to work for your porn, it wasn't ubiquitous like it is now, where I cant go more than three links deep in the Internet without coming across some truly weird "adult content" (no need to label what I'm talking about, but we all know). Hell, I bet you could get from Sesamie Street to ungated "adult" content in five clicks, just using page links.
My point in all of this is, nudity and sex have been a part of life for as long as humanity has been "a thing". So has violence, and I find it hilarious that (as I said before) people are abhorred at the concept of "nudity" in a game but are fine with shooting people in the face.