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.
Castles Made of Sand (novel)
Halfway through "Bold as Love" the two male leads agree that one day they will take oxytocin together — the intimacy drug, based on the hormone released to create the bond between mother and baby, or between monogamous reproductive partners. At the opening of the second episode we meet Ax and Sage loved-up, making out on Brighton Beach on an oxytocin high: a shocking development for readers lulled by the sexual conformity of the first volume. Ensuing chapters are devoted to the painful birth-pangs of a passionate rock and roll sexual threesome.