If what you’re just concerned about people “baring themselves on camera” then they can continue to do that without emigrating to America and it would still affect your culture. The internet is global after all.
Also, it’s going to take more than a few thousand immigrants a year to affect the culture of a country as populous as America.
i mean you said it yourself, the internet is global. those few thousand can have impressions of hundreds of millions. whether they do their cam shows abroad or local matters little. it's the inherent incentivization approved by a government that leads to deeper cultural erosion. if you're in a poor country with no access to education, and your only way into the US is porn, then that's what will ultimately win, rather than incentivizing higher education, etc. And before an argument is made that this will just be a way to get in and then those folks will go and seek PHDs and be productive members of society--i have a bridge to sell you.
The internet is global, but having folks in our midst who make a living that way has more of an effect on our culture than if they are just on the internet.