“Take a whiff, men. A chemical component of other guys’ sweat makes men more cooperative and generous, new research says. The study is the first to show that this pheromone, called androstadienone, influences other men’s behavior and reinforces the developing finding that humans are susceptible and responsive to these chemical signals.”
http://news.sciencemag.org/sciencenow/2013/05/manly-sweat-makes-other-men-more.html
I don’t know if its allowed here or not but it was interesting to read 