The short answer is no, it doesn't work that way. There's no shortage of porn actors in the US, and Americans don't really like porn people (although they consume huge quantities of it - peak hypocrisy, what can I say?). For going this route, you'd need to win a couple of porn/adult awards, prove that you have skills that are in high demand in the industry, and it would help a lot if an American company would hire you with a permanent contract. It would be helpful if you'd own property in the US or if you'd have your own company/LLC registered in the US, but even then you might be able to obtain only a short term visa for business purposes.
You need to be married to a US citizen, or to have close relatives established here for a long time, or to be offered a work visa by an US company, or to become a college student here. Even then, the Green Card might be only temporary (they need to be renewed after a specific number of years).
I moved to the States and got a Green Card because I married a US citizen whose parents were born US citizens, and even then I got my first card for a 2-year term only. After that, I had to prove that I have a real, serious relationship with my spouse for receiving a card for 10 years (joint bank accounts, living both at the same address, filing taxes together, traveling together, appearing both as parties on the same legal documents, my checking accounts were verified for seeing if I'm spending money in the area in which I declared I'm living + you can receive official visits at home anytime to see if you're indeed staying there). I need to announce the US Homeland Security everytime I change my address, they also have a log with all my travels to and from the US, and the FBI has my fingerprints and all biometrics in their database.
If you want to get involved in porn more, try the Czech Republic in Europe, that seems to be the hub for major porn productions and companies on the Old Continent.
I forgot to add that, if you were engaged in prostitution LEGALLY in Europe, you will never be given a Green Card. Even if it's a completely legit and legal occupation in many European countries...
