I think this is a relevant question since most people have come across it, especially if they use the internet.
In my opinion, I think everything about it is bad and negative. For the viewers they are fed a lie about sexuality. It gives them a distorted idea of what sex should be like. I think it desensitizes viewers to seek more and more extreme stuff to get off. It also builds up an unhealthy expectation of what their woman should be like and do. It conditions the mind to see people as things or objects instead of as people with feelings, hopes, desires etc.
As for the people in pornography, especially the women, they are degraded and dehumanized. The conventional "facial" in porn just shows what pornographers think of women - that they are a piece of garbage. It's tantamount to spitting in someone's face. Many women in the porn industry (a lot enter when they are 18 or 19) have been sexually abused growing up so their psyches are really messed up (a connection to why they got into porn?).
If you think it is completely okay, would you not flinch if your mother, sister, or daughter (or future daughter) did pornography?
As corny as it sounds I think pornography destroys the soul. It's focused on the carnal with its warped depiction of sexuality which hurts people spiritually. There is something not quite right with separating sex from love. We are not just mere animals, we are spiritual beings. When we use others as mere tools for our selfish pleasure as shown in pornography there is something immoral and backwards about it.