I would be careful doing this. A lot of Porn production companies will have a more legitimate production company as a cover. It is also works as a good way to find people to work in their porn movies. They get a woman in for an audition then tell them they did very well but aren't right for the part but they do have something in another movie. I do realize you are smart enough not to be sucker into anything like this. Have your lawyer make sure the contract specifies the movie you will be working on and the production company it is for. That it not just a stanard release contract. I might also be a good idea to have them put in there that your face won't be showen (as has been suggested here by others). If this is legitimate she should have no problems with this. You might even offer to have your lawyer make these changes. It will save you from having to send it back to him to check again. If this all works out make sure when you do show up keep it stricty business. Don't slip off for a quicky with her or someone else there just show up and do what the part calls for.

P.S. WW I hope you don't take this as me thinking you are naive or dumb. From your post I can tell you are an intelligent woman. The thing is people who are out to take advantage of other people know what they are doing and have many way to do it. One thing that sort of sends up a flag for me is she brought this up during pillow talk (which implies to me it happened either presex or postsex) a time that would make me think she would be thinking how good you would be having sex on film not about an art type film she was doing.

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it's only kinky the first time

it's not the orgasm but getting there thats fun

a shot in the bush is worth two in the hand

whip me, beat me, tie me up, break my arm, but please don't break my heart

"The trouble with the world is that the stupid people are cocksure and the intelligent are full of doubt" -Bertrand Russell