How does the accessory olfactory system work?

In the past five years, scientists have become extremely interested in the body's "accessory olfactory system," It's just starting to be understood, which causes some skepticism in scientific circles. But this is how the theory goes: The pheromone system starts with nerve cells in a pair of tiny, cigar-shaped sacs called the vomeronasal organs (VNOs), where the signals are first picked up. Located just behind the nostrils in the nose's dividing wall, the VNOs are a pretty primitive structure.

The nerve fiber attached to these organs - specifically called cranial nerve zero because all the other numbers were already taken before it was discovered - responds specifically to scents from potential mates. Nerve zero begins in the nose and ends in the brain area that deals with sex. Because this nerve is important in the sex drive of other animals (whales, if you're wondering), people theorize that it plays a big role in our sex drive, too.

Why? Pheromones and testosterone both seem to be direct drivers of sexual desire and activity in long-term relationships. (Even after we find a mate, we can respond to all kind of pheromones of different people; some attract us and some repel us.) Some research even indicates that pheromones applied to the skin increase the amount of sex between and among men and women.

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