Whenever you look at porn you instantly experience everything which is happening in the picture or movie. If there is more than one person then you would choose which one you would want to experience, you will feel like you are really there smell everything you would expect, seat etc, Feel anything they would feel, feel as though they are that person, it would go into first person but you would still be aware of the third person video unless it's already in first person. This would happen with any porn or any video or picture the user would deem to be sexually enticing. If you REALLY, REALLY do not want to experience that certain porn at that time then you won't and they'll be no consequences of not experiencing it. The user would only orgasm when their character orgasms and other things like that and experience any emotion the character seems to experience.