Knockout experiments concerning pheromone receptors in the vomeronasal organ (VNO) of mice have revealed that

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Knockout experiments have shown that VNO receptors are necessary for male mice to identify whether another mouse is male or female. This is important for mating behavior, as males will only attempt to mate with females. However, this does not mean there is a single gene controlling mating behavior, nor does it mean that a male mouse without VNO receptors will be aggressive toward other males or attempt to mate with another male.

Knockout Experiments Concerning Pheromone Receptors in the Vomeronasal Organ (VNO)