The second thoughts make it hotter imo. She feels guilty about how much she's enjoying it. She feels like she's betraying her husband, but she can't stop cumming on this guy's BBC and soaking him in her cunt juice.
You are probably correct, but if she were offered enough money, and given creative freedom (like Maitland Ward), I would not be surprised if she took the jump into porn. OMG! That would be so incredibly awesome and amazing! Fingers crossed!