Testosterone makes men more loving.
A new study has counteracted previous claims that high levels of testosterone are responsible for sexual urges and aggression amongst men and suggests it can actually make them more tender.
The new study was carried out by experts at Emory University in the US state of Georgia revealed that male gerbils became more cuddly when given a testosterone boost.
Aubrey Kelly, an assistant professor of psychology at the university, said: "For what we believe is the first time, we've demonstrated that testosterone can directly promote nonsexual, prosocial behaviour, in addition to aggression, in the same individual.
"It's surprising because normally we think of testosterone as increasing sexual behaviours and aggression.
"But we've shown that it can have more nuanced effects, depending on the social context."