You probably also guessed that the stripper isn't actually attracted to you.

I've seen some funny comments, but the ones that are like "ur so hot" are baffling.

It's a parasocial dopamine hit. It's like commenting on a Twitch stream. There's a fantasy that they'll notice and reply to you, and suddenly you'll be having a conversation with a famous attractive person.

Identifying the performer to find more of their material, or more of the same genre

We never would have gotten such gems as "give her the dick" without them

I commented on one porn post here on Lemmy where the person was trying to look way too young. I commented in a reply to another comment that was saying it's kind of disgusting and wrong, because the intent is clear that they were trying to at least appear like a child. It doesn't really matter if they're actually of-age. It's like anime with the thousand year old dragon gir thing. If you're trying to create something erotic/pornographic while appearing like a child, that content doesn't need to exist.

That is I think the only time I've posted on porn.

I've posted a few asking why they decided a macro shot of the dude's butthole was what we wanted to see.

Because the posts try to make it sound like they're private messages to you, and men reply in a thread with hundreds of others all leaving the same comment.