This is such an interesting thread!
I've only written a couple of stories, but I never came here to write a sex story. I wanted to write an erotic story, which is different. I suppose people's views on what is erotic differ massively, but to me it means suspense, insecurity, excitement or even the moral conflict of wrong against right. So that's what I write about. Or at least I try.
That all sounds laudable but I'm aware that I'm so busy thinking about these things that my stories lack balance for some people and there's not enough fucking going on. Someone said as much (and that I should use more dirty words).
I managed to squeeze my first story into the lesbian category even though the only lesbian sex comes when one character has a dream about it. In my second story, the sex is so incidental I'd forgotten about it by the half-way point.
Maybe I'm just not very good at describing the act.