*Shrugs* "Porn star" has a sort of status to it. I say nude model because it's a more umbrella term. I know several women that pose nude online, generally as amateurs, but don't mention it publically (unless it's the topic and others do it, then they become open books about the whole thing *shrugs* ).
All of them, save one... Who is essentially a free-spirit nymph, are reserved as much as other women when it comes to nudes and sex, in general. However, all experience the same stereotype that because they like posting nudes to an online public, are plagued by people thinking they are much more open than they actually are... Nudes and the sending of them included.