I remember many years back having to call my (male) GP out on an emergency call (serious UTI, I was feverish for days) where he had to palpate my lower abdomen. I was really ill, and his obvious (and totally reasonable) discomfort about having to examine me with no-one else present just added to an utterly depressing experience. So it goes all ways with that, and yes I wouldn't be thrilled under some circs having a male medic prodding some bits of me in a car! Plus what's to stop someone with a camera phone (read: everyone under the age of 65) filming it all? What's the provision for privacy in the cars?