Generally, the pleasure of the nipples is brought about by the secretion of "oxytocin," also known as the "happiness hormone." The synergistic effect of this oxytocin and dopamine creates a unique pleasure like no other. The nipples, which can be considered a new sexual organ, are found equally in both men and women. In other words, the pleasant sensations you feel when you are teased can be conveyed by teasing yourself in the same way. Please enjoy this mutual nipple play.