Of much greater significance may be the distinction between erotic art and pornography. Sexual desire and sexual interaction are natural phenomena imbued in us by our Creator, and may be expressed in various ways. When those ways are judged to be normal and acceptable in our society, then perhaps the sexual expression should be defined as erotic art.
Pornography, I would define, is that sexual desire and interaction which takes place in ways or in contexts deemed by the relevant society as improper in some way.
This subject is worthy of a great more discussion, but I'm not up to it right now. Bye, now.