I wouldn't say most women have this fantasy, but certainly some do. I think the idea of being restrained or tied up appeals to many women, but in a wider context than just medical exams.
I'm not really into this fantasy, although it has occasionally crossed my mind. The forced orgasm part holds more interest than being tied down on the exam table and restrained. It might be fun to try or experience in a play exam, but I honestly don't think it would do much for me. I'm much more into the clinical and realistic aspects of an exam.