prof and porn

I might be too naive or something but is it only me who finds it uncomfortable talking about sex and porn with a professor?  I mean, I don't think it's wrong at all to talk about sex, but at the same time, I think there are more appropriate topics when a student talks with a prof even outside school.

But curious S (I had dinner yesterday with her and a professor; S is ten years older than me btw) suddenly asked if it was okay for a brilliant doctor who could save 10,000 lives to have an affair in return.  I didn't get what was in return of what.  But that conversation expanded and expanded and led to the prof talking about when he went to a conference in Austria where he watched porn at the hotel.  He was amazed with the Austrian "culture" of "strong women who turned aggressive towards the end".  Sara seemed to enjoy it a lot but I wanted to go home.  (It was pretty ironic how the next topic was how to react when you didn't find funny what the other person found funny.  Oh, but was it me who brought it up?)

Don't get me wrong; I usually like the prof and we did have some interesting conversations too.  Like the three principles of life,
1. 精神を壊すほど大したことは、人生においてほとんどない　There are very few things that are worth sacrificing our mental health for.
2. 自分は大したことのある人間だとは思わない方がいい　Don't expect too much of yourself -- always keep in mind there's little we can do
3. 放り投げる勇気が大事　Be brave enough to give up

We also talked about even more serious stuff like how when a doctor faces a patient, it's only one body out of a hundred other for him, while it's very different for the patient -- it's the only body he has.  If the doctor makes a mistake, he has another chance, but the patient?

I'm not saying I *only* enjoy talking about life principles and answer-less philosophical questions; I don't go around forcing my friends a debate on "how to be happy".  I enjoy meaningless conversations.  And I probably can enjoy talking about sex.  But with certain kind of people.  Definitely not my professor!