The Human VNO's role is to detect chemical signals separately from the olfactory system. While the system is similar to olfaction in design, the VNO has it's own alternate pathway to the brain that leads directly to brain structures that regulate sexual behavior. This alternate neural pathway is what explains why the chemicals that cause sexual attraction do NOT need to be smelled in order to stimulate sexual response. The animal may or may not be aware that it is responding in order. This opens up exciting possibilities for secret love potions.
Human pheromones are NOW available for use as sexual attractants.
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