It’s known that oxytocin is emitted into the blood when people have sex. For centuries, midwives have told women that labor can be hurried along by having intercourse. In modern times, obstetricians have used dilators and water-filled balloon devices to accomplish the same job. The reason why these devices work and why intercourse can initiate labor is that both stimulate the vagina and cervix, just as in voles having sex and ewes undergoing VCS. It’s also highly probable that oxytocin is released into the brain at the same time because, as Murphy showed in rodents, the brain’s
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