Ah, Literotica. I used to post there, but never wrote/published anything there. Mainly because erotica is an area I found that I can't write in.
It is a shame that it has the reputation it has, though. The site has a split personality like you wouldn't believe.
First, you have the people who post in the forums. They are intelligent people- professional and serious in their writing. Unfortunately it stops there, as 95% of the people who publish stories don't post or take their writing seriously.
And those that do both are often driven away. The last time I posted there a few years back, I saw a topic about this. It was a VERY disgruntled writer who took the craft seriously. He (I assume it is a he) posted a very well written story... and was subsequently mocked for it. The reviews for the work were nothing more than comments about how much he was scum and his work (despite its quality) was utter garbage.
So yeah, many writers there take this just as seriously as those at this very site. But you don't see it as it is so open to the public, and ANYONE can get published on a site like that.
I also have an admiration for that site's administrator. She is one of the few website owners who will fight tooth and nail to protect the writers on the site. Many times material has been 'stolen' and used on porn sites, and she knows all the legal ways to protect their content. You wouldn't believe it really- a site like that, you wouldn't expect a mama bear.
(And I must point out that writers there HAVE been published.)
So yeah, please don't lump everyone there into the collective of terrible writers that really do just use it to get their rocks off. I'd also like to say I haven't been there in awhile so it MAY be different now, but at the time it was one of the most helpful places I've been to.