If you consume porn, then you are prepared to accept that the person/people you are wanking to did not enthusiastically consent because at present there is no way to know that the performers are not coerced in some way. Which makes you complicit in exploitation, trafficking and rape.
What you're getting at here is the idea is that there is a chance of exploitation having occurred at some point in the supply chain. You're wording it deliberately salaciously, but that's the case for absolutely everything.
Do you know who made the clothes you're wearing?
Do you know if anyone has developed ling cancer as a result of burning plastics to get the materials to build the device you're posting this from?
The only way you can be 100% sure that your actions aren't having a negative impact on someone, somewhere is to go back in time and stop yourself being born.
The advantage that sex workers have is that we know for a fact that some people enjoy doing it and even more aren't significantly more negatively impacted by it than any other job. You can't know for sure about the circumstances of any individual you're watching do anything.