I certainly recognize the gut-reaction of "why is such and such published and my story isn't," and this really isn't the place to start a discussion on the topic, but let's not get too snotty here.
This piece was published, because it impressed a number of readers at Clarkesworld, including Neil Clarke, and was put up for the nebula and the Hugo, because it managed to impress a lot of people besides. It may not be your cup of tea, but let's not get insulting.
Personally, I found the story unique, provocative, and very well written (not a fan of the ending, but whatever.) I can easily see how, if you're reading hundreds of submissions every month this story would stick out from all the rest. And for the record, it is certainly not pornography. I'm not a specialist on the subject, granted, but I'm pretty sure, aliens aside, porn is written VERY differently from what we see here (and of course, with very different intentions.) Sex (if you want to call it sex) does not equal pornography.
I don't mean to get preachy, but I'll just throw this out there. This is something that's not easy to do, and it took me a while to learn to do this myself, and even so, I can't do it all the time. Still, try to, instead of looking at a piece of writing and thinking "I could do better," ask yourself, "What could I learn from this writer, this story? What does he/she manage to do well?" Because if you honestly believe that a writer does nothing well, that a story accomplishes nothing, then IMO you're not looking hard enough!