oxytocin

noun

1. (countable, uncountable)A hormone that stimulates contractions during labor, and then the production of milk; also plays a role in social bonding.

   “Some women describe episodes of intense pleasure akin to orgasm during nursing. It would be interesting to know whether the release of oxytocin during suckling plays a role in this subjective feeling, as it may do in actual orgasm.”

   “MDMA, commonly known as Ecstasy, greatly increases feelings of empathy (and perhaps the actual capacity to perceive the emotions of others); one of the mechanisms (oxytocin release) is now becoming understood, […]”

   “When human beings bond—by hugging, kissing, touching, having sex, eating together, giving massages, or even when singing together or speaking reassuring words—oxytocin brings us “in from the cold,” warming us—quite literally—as it redirects blood flow into hands, feet, chests and cheeks.”