"but bringing up child porn in this context is a red herring because the creation of child porn victimizes actual children"
You make a great point. There is a glaring difference in that child porn victimizes actual children, whereas adult porn never victimizes actual adults, only imaginary ones!
Don't get me wrong. I'm not against porn by any stretch of the imagination (excuse the pun), but lets not pretend that the adult film industry is sans exploitation.