Re: Mind over Matter? Embarrassing Doctor's visit.
This is a very normal physical reaction. Doctors are very used to it and they don't see it as being awkward at all.
If you're really that nervous- tell the doctor. Guarantee you she'll say that that it happens all the time and its no big deal. She's not reading into it, she doesn't think you want to bone her. She's a doctor and if she's any good at what she does then she'll understand that some people are just very physically reactive. Getting an erection is like sneezing in a way, its not usually a voluntary response but rather a physical reaction which men don't put much thought into, it just happens.
Heck, I've known some women who become wet during pap smears NOT because they are aroused (trust me, nothing arousing about it) but simply because its the body's natural response when we feel we are about to be violated. We don't want to be violated, but we know its going to happen and it will hurt less if we are well lubed so some (not all but some) women's subconscious will cause them to get wet to make the experience less painful.