I'm not sure whether you're referring to posting STORIES on SOL, or posting stories about our FIRST TIME on SOL.
But I tend to write drama, rather than stroke stories. My first posting on SOL was was an extended series (6 books), and like all of my work, was finished and completely edited before I posted the first chapter. I hadn't finished what would become the 5th book and hadn't even started the 6th, but I was well on my way, so I may not be typical.
What IS typical, is that few of us ever expect to garner more than a few reads, so we're mostly universally shocked when our stories prove to be popular. In my case, I write using an older writing style with overly complex plots—the kinds of stories I prefer to read but didn't find as much of anymore—so I really didn't care whether many people read them or not, since I was writing purely for myself.
That said, almost everyone starts out writing about sex. It's only when they've been posting for a while that they feel comfortable modifying what they post by limiting the 'main draw' (i.e. the sexual content).
At the time, I cross-posted to SOL and ASSTR, so together I got around 12,000 downloads a week (which is much better than I've gotten since then, now that I'm only posting to SOL and it's sister sites). At the time, I would have been happy with a hundred and hopefully a few fan letters (I'd been lurking on the site for a long time, so I basically knew how everything worked and basically knew what to expect.
As far as how I reacted after posting, I watched every single download clock, waiting with baited breath, nervous how my material would be received. The first story had PLENTY of issues (it's been revised a number of times (twice before I ever posted anything), and once before I finished the entire 6 books. Even now, I'm contemplating revising the entire series to bring it up to my current writing standards while hopefully keeping the heavy character development which marked that first project (and was probably why it got so many downloads).
Switch, now that you mention it, having spent so long preparing for my first posting, I sometimes think of many newbie authors as 'prematurely posting' their stories, before they know how the story (like their initial erections) will hold up. 'D