The fact that ‘you’ claim porn doesn’t harm women is proof that it does. Because such a claim indicates that you are so accustomed to seeing women sexually subordinated you think there’s nothing wrong with it. Such a claim proves that that porn has skewed your perceptions so much you actually believe the women are enjoying, asking for, whatever it is you see. (They’re pretending, asshole. They’re acting. According to some guy’s fantasy script. And they’re doing so because they’re getting paid.)
Such a claim also proves you haven’t read the research: for example, compared to those who did not watch porn, men who watched porn were more likely to have aggressive and hostile sexual fantasies, more likely to say that women enjoy forced sex, less likely to be bothered by rape and slashing, and more likely to consider women subordinate and submissive.
The research also indicates that males are starting to watch porn as young as eleven these days.