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Just like in any profession where men and women are spending the majority of the good hours of their day together. People at work are often on their best behaviour, presenting themselves well, sharing a social group with each other and working on shared goals together. It is a very easy environment for affairs to get established.
There are just as many female's training to be doctors as males these days. So I actually found there were more junior doctors dating fellow doctors, than nurses dating doctors when I was working in the hospital.
Yes, my obstetrician had an affair with his nurse. They are now married and his ex wife is also a Dr and she married one of his good friends. I know of several Dr + nurse marriages too. Also police + nurse marriages is another match up that seems to happen a lot.