Pheromone cologne contains a natural chemical substance that is meant to increase attractiveness by means of scent. A few different types of pheromone colognes are on the market, including Pherazone and Nexus Pheromones.
Many pheromone manufacturers make claims that their products attract the opposite sex. Often wearing a pheromone cologne can be a bit of trial and error to find what suits each individual. Just as hormones work inside the body, pheromones are meant to work outside, affecting an individual's odor. Pheromones influence animals and their behavior, but do not influence humans in the same manner.