and if those thoughts make you cringe slightly then that shows you how porn involves the viewer seeing the models as sexual objects rather than as persons (with their own needs and desires and preferences and hang-ups etc).

one is training ones body to feel sexually stimulated in response to an object.

i think that porn often is harmful to the people involved in the industry (models are often poorly treated DESPITE the image that the industry attempts to convey). society also has a negative view of people who participate in the industry (the majority of people wouldn't like it if their mother or sister or daughter participated in it). the majority of people wouldn't want their mother or sister or daughter or wife to participate in the industry because they think it would characterise them as 'sluts' and that other people would view them with disrespect.

this is to say nothing of the children who are sold into the industry and people who are literally forced to participate in it who are obviously incredibly harmed by the existence of the industry.

i think that porn often is harmful to the viewer because it encourages the viewer to have a sexual response to objects rather than persons and because it often encourages the viewer to have a sexual response to violent themes. people who have that pathological tendency already get to indulge / encourage it. people who don't initially have that tendency often train their bodies such that they do develop that tendency. at the very least it encourages a person to view sex as an activity where one does what one wants to an object. the majority of porn is male centered and involves disregarding the very things that females take most pleasure in (foreplay etc).