Well, that was...
... bizarre. And soul-scarring. And side-splittingly funny. And, once you pick your jaw off the floor... oddly faithful to the source material. While there is not likely to be a canonical description of each of the Mane Six's approach to sex anytime soon, most of the ones given here seem very plausible ( Fluttershy's and Rainbow Dash's
might be out of left field, but that's because it's funnier that way
). In particular, once you stop boggling, you realise that Pinkie Pie is completely in character. How would she approach sex? The same way she approaches everything else.
And did I mention how incredibly funny