To be clear, I'm reading your response as against porn in all forms and for all audiences based on your wording, is that what you mean?

Yes.

How can you be against porn?

I am against porn because I am against prostitution, and porn is a type of prostitution, with the same problems of prostitution plus some more. The central problem is sexism.

It's neither good or bad, it exists and I basically don't watch it, but I recognize that others do, why is that a problem that needs solving?

Good and bad are Manichaean categories, as a materialist, I avoid using them. My problem with pornography is the reality of it as well as the reality of prostitution in general. The porn industry is the home of abuse, in every sense. First in the rawest sense, the physical and mental abuse that actresses go through; second in the reproduction and propagation of the culture of abuse, considering that it is the most recurrent theme in porn films; third in the economic sense, pornography, like prostitution in general, is the sale of consent: the actress or prostitute receives money to have sex with someone she would not have sex with under other circumstances, in short: paid rape.

I do not, however, advocate banning either prostitution or pornography, mainly because it would not solve the problem and could even worsen the vulnerability of women in these professions. I however think that pimping should be criminally punished, just like porn networks, which are just a socially accepted form of pimping. Several social problems produce prostitution and pornography, mainly economic inequality, but also the misogyny embedded in the culture of our society, and only a different form of sociability could put an end to these practices. As long as we are not living in this new system, governments can take palliative measures to alleviate the various problems of these practices, but this is not the case at all with this measure by the Spanish government.

EDIT: I have corrected the third link to the article where the information comes from.