Originally Posted by DarkScribe
Erotica is not another word for porn. Both porn and erotica serve to stimulate sexual desire, but in the case of erotica, it is done legally and usually with taste. Porn is crude and generally more gynecological than artistic in nature. You will find erotic images on public display in many well known museums, but you won't find porn there.
Porn is legal, and taste is subjective. The distinction is arbitrary; porn is erotica you don't like, erotica is porn you don't like. Qualitative distinctions do not exclude works from a genre, a mystery is still a mystery whether or not it is in good taste (which is, again, subjective).