@Sandwichman:
…not entirely what I was getting at there. Of course reproduction occurs, that's a given, but reproduction and R34 are not the same. What I meant by "legitimizing" was more that the R34's been more clearly defined as a concrete event within the reproductive timeline (duh, right? well, read on).
When people create R34, they're doing it for pretty specific reasons and with pretty specific outcomes in mind, and pregnancy is not one of them. There's a difference in how most people view "sex" and "reproduction," and I think the picture links the two in a very down-to-earth way. Now that's okay in and of itself, but the problem is that most of what goes on in the R34 world is pretty goddamn depraved, and it's not something that most people would like to think goes on in Equestria (we've been through this ad nauseam).
So my issue is that the picture links all that nastiness that goes on in R34 with the natural reproductive cycles of ponies. Usually those things are highly separate in my mind, but for some reason, this just blurred them together. But that's just how I see it, which is why I'm curious to hear other peoples' reactions.
@Giga and Dr. Greg: You both think it's a sweet (emotionally) picture. I should explain my view: I see Twilight as being somewhat melancholy here. There's something in her expression that, to me, shows regret and sadness. Also, the fact that she's alone speaks volumes to me too.
Of course, I could easily be off in my own little world of interpretation here, but that's just how I see it.
And yes, Giga, I totally agree that that should have been Derpy and not RD.
INB4 BSOD: Yes, true, but where's the fun in that? You know I like to overanalyze everything…