They are the equivalent for some, but I don't think they are equal. Women (and men) usually do not disapprove of porn because of the recipient's excitement. They disapprove because visual porn means that real women (and sometimes men) are being exploited, and may have been from a young age, or whilst they are in the midst of a drug or alcohol addiction. They may also be trading STIs, or getting unwanted pregnancies etc, having abortions. However, porn stories and erotica are created in the imagination of the author, and explored in the imagination of the reader. No one is harmed in writing the stories.