Oxytocin is a peptide of nine amino acids produced in the brain's hypothalamus, functioning as both a hormone and neurotransmitter. Research has shown that in addition to its bonding effect in couples and between mothers and babies, it also stimulates one's social approach. "Our results suggest people are willing to bend ethical rules to help the people close to us, like our team or family," says the lead researcher. "This raises an interesting, although perhaps more philosophical, question: Are all lies immoral?"