Yeah, I'd have a problem with that. I don't even worry about my husband socializing with our friends by himself, and when for some reason I can't attend a function I encourage him to go alone, have a good time, I'm not his chaperone or watchdog. My trust in him is complete.
But seeing him stick his dick into some other guy in a porn movie, having sex, even if it was all staged, would be a bit much for me. His dick is my exclusive property, as mine is for him. Maybe it's all pretend for the camera, but I guess I'm not that sophisticated. No, I don't think I would handle that well at all.