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Would you let your GF star in a porn orgy?

My girlfriend has been offered $500 to be the star of a massive gangbang, there are suppose to be as many as 100 guys at the place. She will be expected to perform the wobbly pelican, fitting as many dicks inside her mouth as possible, blowing several guys in a line, double stuffing, beer bongs filled with cum, etc.

The only problem is that one of the guys is her ex-boyfriend. They went out a few years ago, but it was nothing serious. I don't even know if they had sex, and that is part of the problem for me. I think she only wants to do this so she can blow and [censored] him and stuff. She claims that she isn't going to get any excitement out of all of the sex that day, and that she is only doing it for the money. There is also a good chance that she is going to be blindfolded and gagged for a good bit of time, so she might not even know she is [censored] him. How can I be so sure though? I trust her a lot, but this seems like a little too much for me to handle.

What is the correct play in this situation? Should I sit back and do nothing or should I let her star in this film? Any and all advice are welcome.