Ahhh... great questions and much food for thought here.

Wikepedia says: http://en.wikipedia.org/wiki/Pornography

In general, "erotica" is used to imply artistic quality, sensuousness, or implied sexuality, whereas "pornography" tends to signify explicit sexual acts.

There are a number of essays out there on the subject. For me the short version involves the writing style. Are we reading about the senses and emotions of the people being described or is it more, insert stick A into slot B?

You might enjoy this essay:

ONE PERSONS PORN IS MY EROTICA by Rose DesRochers

http://www.freelancewriting.com/arti...rs-071405.html

About plotting...

I think that well written PWP story - that's "porn without plot" or "plot, what plot?" can be very erotic.

Those types of stories have their place just like longer tales.

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Now about those endings. I've read some wonderfully hot stories in the library then been so disappointed by the ending, that they become a huge turn-off.

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StillBehindBlueEyes,

You certainly don't write vanilla.

The Training of Shauna the Pet is a string of snippets, with a back story and a plot that weaves them together.

Erotic or porno? That's up to each reader.