Oxytocin
Oxytocin (Oxt) is a peptide hormone and neuropeptide. Oxytocin is normally produced by the paraventricular nucleus of the hypothalamus and released by the posterior pituitary. It plays a role in social bonding, sexual reproduction, childbirth, and the period after childbirth. Oxytocin is released into the bloodstream as a hormone in response to stretching of the cervix and uterus during labor and with stimulation of the nipples from breastfeeding. This helps with birth, bonding with the baby, and milk production. Oxytocin was discovered by Henry Dale in 1906. Its molecular structure was determined in 1952. Oxytocin is also used as a medication to facilitate childbirth.
Homewrecker
Scientific American, tongue-in-cheek, referred to oxytocin as a homewrecker. The hormone normally triggers a nesting instinct, which makes it a "home builder", not a homewrecker. But with chronic exposure in prairie voles, a study instead showed a breakdown of the normal nesting instincts: The animals avoided pair bonding and child nurturing. This raises questions about the growing practice of using oxytocin to treat behavior disorders such as autism.