We just started talking about the evolution of social behavior in class today (April 3, 2013).  We also discuss in class how something olfactory cues can help us choose mates that are immunologically different from ourselves, so potential offspring may have better immunity against diseases.  This article/blog post addresses some of the more social cues that we receive from, well, body odour!

Can You Smell Personality? | Beautiful Minds, Scientific American Blog Network.