What's This All About?

Hi there,

i'm a 27 yr old male grad student. There's a girl around my age i've seen around campus and always exchanged looks with but didn't talk to her. I'm extremely attracted to her looks, style, and what i've deciphered about her personality (which is admittedly little). Anyway, I walk into an office the other day to say hello to a friend who brought a puppy in and boom she's standing right there. I was very nice and introduced myself. I noticed that her nipples became hard immediately and could be seen through her shirt. I didn't stare but noticed later they had disappeared. During my time in the office I paid her a lot of attention and told her it was nice meeting her as I left. I didn't ask her out then because too many people (including faculty) were around. I plan to ask her out next chance I get. Anyway, my question is, do women's nipples get hard like this when they are attracted to someone or is it more likely the cold or something? I've seen this a few times and i'm intrigued.

Thanks