* [[Reproductive_Behaviour_-_Attractivity_Behaviour_-_Anatomy_%26_Physiology#Pheromones|Pheromonal]] substances in the [[Normal_Composition_of_Urine_-_Anatomy_%26_Physiology|urine]] act as a stimulus to enhance the onset of puberty. | * [[Reproductive_Behaviour_-_Attractivity_Behaviour_-_Anatomy_%26_Physiology#Pheromones|Pheromonal]] substances in the [[Normal_Composition_of_Urine_-_Anatomy_%26_Physiology|urine]] act as a stimulus to enhance the onset of puberty. |