I enjoy your posts on this board - you sound like an intelligent, good person.
So I have to ask why you haven't kicked this a**hole to the curb. This isn't a question of being sexy or kinky. As others say, this is a question of fundamental lack of respect for your health, and lack of respect for you as a human person with rights and dignity.
A health exam is to focus on you, the patient. The patient should be focusing on what's going on in the exam, and the patient should be asking questions.
The patient should not be thinking about whether her freak of a boyfriend is getting enough of an erection from the experience, and whether he wants a quickie on the exam table after the doc leaves, and if he'll be more in the mood later to screw your brains out, having seen someone poke at your ovaries for all of 10 seconds.
It is appropriate for partners (boyfriends, significant others, spouses, etc.) to go to an exam with you if the are there for the betterment of the health of the patient.
If they are there for their own gratification, and to further humiliate and degrade you (which is really what your boyfriend is doing), and to find new ways and situations in which to make you an object - then they should not be at the exam.
In fact, they should not be in your life.
Organica, time for a reality check. Besides some orgasms, is this person bringing anything positive to your life? Is he making you a better person? Or is he just making you a sex object? Does he respect you? (If you say yes, then how could he dare to ask to come to an exam so he could get off!?!?!)
Think about this one. Yes, I don't know you or your boyfriend, so maybe I don't know what I'm talking about. But I think, perhaps, I do.
I think you and your boyfriend need to have a long talk about this one - and if you both can't talk about it, then I think it's time to end this.
To me, asking to watch an exam is, on some level, similar to if he asked to watch you get raped. It's all about him, not about you. And an OB/GYN exam should be about YOU.