What is it about the state of marriage that makes you want to enter into it before you have even met a man you could contemplate marrying? Marriage is something that gradually evolves as an option between two people. For it to be a happy one is not just a 'lifestyle choice'.
Seems odd to me. This chap was probably just being pleasant and anyway, he's married so it's a big warning 'hands off' sign that should be flashing up.
As Retrochic asked, is your involvement with Asian people colouring your attitudes? I find it had to envisage being 'petrified' in case I had a male doctor, no matter what I had to see a doctor for. I admit to a preference for a female radiologist when having a mammogram done, but that is because they understand how painful it can be and they are gentler than the males.
A doctor sees you as a case, a body, a problem to be solved/helped that's all. Please relax and lose the fear of the opposite sex - they're only humans, just like you. :)