Rather, they informally observed twin women at a bar. One twin wore the pheromone scent, while the other wore a placebo. Much to the delight of pheromone marketers, the twin wearing the pheromone was approached more often by men than her sister. While investigations such as these may convince a consumer that pheromones added to fragrances are a worthwhile investment, nothing has been revealed about human pheromone perception. To answer these questions, and many more, rigorous scientific study is required.
Pheromones are chemicals employed in intraspecies communication.
Pheromones may be proteins, steroids, or any other chemical released by the body. The sensory system that perceives pheromones is similar in many ways to the olfactory system, particularly in that both systems transduce chemicals. The specificity of the VNO is still ambigious. Whether humans have a VNO or not has been debated. If the human VNO does function, its behavioral implications are dubious.