Office Nipples

Pray tell, dear readers, what do you make of the following scenario?

A man is going about his morning routine of delivering and collecting mail around the many offices of the large organisation in which he is employed.
In one of those offices he begins a conversation with a woman he enjoys talking to and who, by all indications, enjoys talking to him. They are standing next to a large office machine being operated by another woman. In the middle of this conversation, the woman who a second ago was operating the machine approaches the man and woman and, with a big smile, leaning forward slightly and standing directly to the side of the woman, appears to examine that woman's breasts from her side-on perspective.
The man and woman are confused and maybe even a little embarassed by this odd behaviour, and even though the conversation is halted momentarily, they do not betray any signs of alarm or indignation. In fact, the man finds it rather amusing. And not only does the man find it amusing, but when he looks from the first woman's breasts (which, naturally, he could not help - there may very well have been something interesting to see there) to the second woman's breasts, he notices that her nipples are clearly erect beneath the red fabric of her sweater, or t-shirt, or whatever it was.
The only conclusion the man can reach is that, since he well knows that many women complain of the low temperature in these offices, it must be that she wants to find out if the other woman is *feeling it* to her own degree.
But that would raise the further question: Is this appropriate office behaviour?