The delicate interplay of hormones and behavior (not to mention culture) that goes into the nebulous state we term “libido” is complicated beyond human understanding. But, what we do know is that airborne hormones called pheromones that bounce between all living things, plant and animal, speaking volumes. These molecules program human behavior when it comes to mate selection. Individual immune systems literally choose the perfect compliment for success in reproduction.

That’s the reason, one person looks so hot and another equally likely candidate doesn’t. That’s why they called the Al Pacino movie, The Scent of a Woman. Both men and women have a distinctive odor that can’t be detected as a “smell”, but can be registered by an organ behind the nose called vomeronasal organ, or Jacobson's organ.  Animals and plants exchange pheromones, too. That’s why men bring flowers to women in exchange for the possibility of sexual favors. The flower release pheromones that can mimic sex hormones in our brains.

Terence McKenna proposed in his book "Food of the Gods" suggested that certain chemicals produced in abundance in various hallucinogenic plants and fungi, such as dimethyltryptamine and psilocybin may act as pheromones produced by one species (the vegetal) waiting for absorption by various others, for example, early primates. In this way a kind of ecological pheromonal system may be at work among species and ecosystems that have coevolved closely for long stretches of time.

In your own bedroom, the ecosystem between you and your significant other is also pheromone-controlled. Since pheromones are airborne hormones, they “fall-off” the same way our major endocrine systems fail as we age. That means we lose our scent. We don’t smell sexy anymore, because we don’t have a cycle. (see page 26 in Sex, Lies and Menopause) Men exude the same chemical attractants…or don’t, depending on their age. The same way libido is a brain function driven by estrogen in both men and women (men convert testosterone right in the brain to estrogen to drive libido), pheromones can only happen in fertile or, in our case, pseudo-fertile animals. Another reason to consider the Wiley Protocol®