Have you been on a porn shoot before? It's definitely different. A friend of mine does photography and did porn in Cali for a bit, it's definitely more of a job than it is sex for fun.
I mean... It depends.
Some porn shoots are definitely just work. Usually a big studio job (with some exceptions) is just work. Lots of cuts, hours between shoots,etc.
Other ones are a bit more free-form and more like RP sex that some one happens to be filming.
Onlyfans content is usually just "Hey I'm filming let's fuck." because that's the allure.
Honestly the porn industry has changed alot since the 80s to the 2010s and even more from the 2010s to the 2020s.
There are even big studios now that are all about "just have fun and we will film it" which used to just be the realm of the indies.
Having said all that.
If you decide to do porn/sex work always research who you are working with. Always get paid well and upfront. Always express your limits and don't allow them to be broken. And never work for "exposure"