I mean logically though think about this,
Yes, you may be exclusive attracted to females and vaginas right? but when we have sex with the opposite sex, we NEVER (normally - because kinky sex might) see genitals from others (outside of the male or female you're having sex with). so if you're a male hoe or a female hoe and have a large body count, it's still "natural" in the sense you fukking the opposite sex.
But if you constantly watch porn where there is another male genitalia is in the shot, over time, your brain will equate arousal with Vaginas AND Penises. this is why Porn can be very negative to the sexual health of an individual. how many straight guys watch only lesbian porn? not many, and even then, you'll begin to lose the ability to be aroused by just 1 vagina, now you going to need 2-3 bytches in your bed just to peak.
Porn is dangerous because as OP has mentioned, it rewires your brain. the things you do, the things you like and dislike is all learned. meaning you can easily unlearn to like something or easily learn to like something based upon repetition and exposure rate.