Porn is bad for the watchers, for relationships, for the performers, and for society at large.
I could write at length on all of these issues - but to restrict my comments to the direct questions in the post below:
“You have more sex and more orgasms in a good relationship than you do with porn…”
a) children much younger than relationship age are discovering and obsessively watching porn;
b) a “good relationship”, in sexual terms, is maintained by each partner making sure that they’re fit, healthy, attentive, attractive - all of which is rendered obsolete by porn;
c) acts in pornography can be arbitrarily extreme, inducing a kind of sexual autism, while a relationship introduces healthy moderation;
d) a sexual relationship brings goods between the partners (love, connection, nurture) and societal goods (children, motivation to pair bond and marry) - while porn brings none of these things, just sterility.
All of this crushes the healthy relationships and social dynamics which are an essential part of growing up.
Securing a desirable sexual partner is a huge impetus for the pursuit of personal excellence. Without this, the young can turn inwards and accept mediocrity and unattractiveness.
The whole framing of the post and the thoughts of the author shows the fundamental issue with porn - he is entirely thinking about sex as an atomized individual as opposed to a social activity. “How does this affect my prolactin levels” is the last thing you should be thinking about when deciding how/if to have sex.