Oxytocin and Prolactin both play a key role in lactation. Prolactin is the hormone responsible for milk production, whilst Oxytocin, often called the hormone of love, delivers the milk made in the breast. Oxytocin also causes the contractions of an orgasm, and it’s not unusual to leak breastmilk during sex due to the crossover of hormones involved. And in a study in 2012, blood samples were taken from a group of 7 women to access their prolactin levels over the course of 32 hours. The study foun