The sense of smell is an amazing sense, which enables to receive external stimuli. It turns out that it allows to receive aromatic messages from others, informing us of their emotions or attitudes. This is the only sense informing the subconscious part of the brain, bypassing the area responsible for rational thinking. Each of us has the so-called vomeronasal organ (VNO) in our nose. Pheromones, as volatile aromatic compounds, reach that organ and cause automatic, uncontrolled reproduction and social reactions. VNO neurons are strongly connected with the centres controlling the sexual behaviour and reproductive system functions. It is said to operate in a more primitive, insect-like way, while the main olfactory organ developed later and operates in a totally different way. For short, VNO can be described as an additional olfactory organ, which converts volatile aromatic signals into the relevant body response.