Hmm, I am not sure, there is a possiblity he is! Are you into him? I always have found professors sexy...I think its the fact that they had power over me. It's a huge turn on. I actually ended up dating several of my former professors and even married one! So I have a little expertise in this area.
With all of my previous encounters with professors, absolutely nothing happened while I was in their classes. Believe it or not, professors take that very seriously, as even one accusation from a student about innappropriate behavior could really hurt their career and their chance to get tenure. They must behave professionally at all times and most of them do that. The professor of mine that I married (now my ex-husband) barely acknowledged me in class. He treated me exactly the same as all the other students...he later told me that he had to physically make himself not look at me in class unless I was speaking. When he heard that I was transfering majors at the end of term, he sent me an email to ask if I wouldn't mind meeting him to discuss what actions/events led me to change my mind about this career path. At that meeting we talked a little about school and then spent most of the rest of the time talking about one another. That is how our relationship got started but if you would have asked me while I was still in his class if I thought he was into me, I would have thought you were crazy. It was pretty much the same way with the other professors I dated...absolutely nothing happened or was suggested until after they no longer had an influence on my grades.
I know you hear about professors banging their students all the time, but in reality, it doesn't happen all that often. And the ones that do that may not be the best to get involved in because they may not place a high value on their career or integrity. My one piece of advice is that, if you are into him, you must absolutely be the one to make the first move and please wait to do it until after the class is completely over and grades are in. He cannot make the first move because what if you got freaked out and said no...he could get fired.
That's my take on it, hope it helped some!