- The new study suggests that men may be wired to nurture.
- The male hormone fell by 34 percent after men became fathers.
- Testosterone levels in more than 600 men showed marked declines in salivary testosterone.
- Research in some primates has shown that when a father sniffs the scent of his own babies, but not strange babies, his testosterone drops within minutes.
Men experience a drop in testosterone after the birth of their children, a phenomenon that may help them meet the challenges of caring for their offspring, said a study released on Monday.
Testosterone is a hormone that fuels male sexuality, aggression and physical robustness, and is typically highest in young, single men with no children, said the research in the Proceedings of the National Academy of Sciences.
With less testosterone coursing through their veins, men are more likely to adopt fatherly roles and help nurture their children, a particular need among humans who have much longer dependent childhoods than other mammals.