"Pheromones come in two forms: "primer pheromones" that cause slow, long-term physiological changes such, as hormonal effects; and "releaser" (or signaling) pheromones that produce rapid behavioral effects, such as mating. Pheromones are not cognitively processed chemical signals, but rather elicit instinctive and presumably unconscious responses. Moreover, pheromones typically do not have a scent per se and are often in a liquid medium." - Lit