There is a lot of territory to cover in this subject, of why people respond or not to a posted story.
When I like a story, I sometimes respond, sometimes not. Mostly, I think I do respond when I like the story well enough that I want more stories in that same vein, by the same creative imagination, promulgating the same general world-view. I like the feeling that there are other intelligent, perceptive, thoughtful people in the world who love the glow of happiness brought on by good sex, celebrated early and often in life.
I consider fiction to be a craft, in effect one of the major practical arts. It should convey thoughts, feelings, ideas in a manner that grips the reader's attention and gives it a good shake. Since it is a craft, it should be well done, nicely polished. It should have style. I like it when the words are totally transparent, such that I don't even notice them, I only notice the 'message.' I don't want to see typos, clumsy or awkward constructions, dense page-long paragraphs, or any of the endless varieties of literary zits that spoil what should be a beautiful face.
It should provoke associations in the reader's mind that reverberate in semi-predictable ways--somewhat predictable in that they circulate throughout the themes of sex had and done the way I like it, and somewhat unpredictable in that writer and reader are ultimately strangers to one another, such that as reader I like to be pleasantly surprised by connections I would probably never have traced for myself, but am happy to follow when led by a capable hand.
I see now I am drifting away from the Main Topic, and starting an essay on the philosophy of erotic fiction.
I tread a narrow path of sexual pursuit. I don't do other peoples' preferences, and don't expect them to do mine. If a story is not up my alley, I don't read it. I don't care how well it may be written, or how many other people love it. I don't have time to read them all, so I scan, then skim, and home in on what appeals to me. If you see that I have responded to a story, then you will know it appealed to me. Back in the days when I reviewed music, I only reviewed music I found to be top of the heap. What's the point of telling a performer his music is not to my taste? If he has an audience, let them enjoy each other.
If I read your story and wish I could be be part of your world, or the world of your characters, then I will at some point be moved to respond.
Thanks to all the good writers, many blessings upon you all.