My stories contain some erotica as part of erotic romance and I see this as a true showing of the love between the two people, but at all times the man shows respect and care for the lady -- an old fashioned concept these days -- but this is how I feel love should be.
To define the differences in my view:-
The difference lies in the emphasis of the title, to me an erotica writer writes mainly erotica and that is not (!) me. While a writer of erotica writes erotica as a part of their larger scope of writing this is (!) me.
I prefer to define myself as a writer -- no genre -- but if you need to categorise my stories then I am best described as a ghost or Gothic horror story writer.