Thank you for following the Principle of Charity, (maybe better than I did.)

Of course you can find good-old-fashioned amateur porn out there. It might even be useful! But, as you said, in a vacuum: It's now your mental model.

Bob and Alice uploaded a porn video where Alice is on top, and now Chuck just knows that's how sex works.

It wouldn't be so bad if Chuck went through the next few years of life thinking that. One day, he'll meet a girl and learn that sometimes the man is on top.

But: You know what's out there on the front page of the most popular porn sites. Pornhub. Xhamster. Not exactly wholesome amateur love making.