Evolutionary theory suggests that a man's testosterone (T) decreases after his fathering of
children, when his priority shifts from mating to cooperative parenting (Fatherhood: Evolution …

Most research shows that fatherhood is related to reduced testosterone (T) levels, but
relationships between the number of children and T levels are not addressed. In humans …

In species in which males care for young, testosterone (T) is often high during mating
periods but then declines to allow for caregiving of resulting offspring. This model may apply …

Past paternal psychobiology research has focused almost exclusively on biological,
residential fathers and the role of fathers as direct caregivers. Here, drawing on a large …

In order to study the hormonal correlates of the tradeoff between mating and parenting effort
in human males, we examined the salivary testosterone (T) levels of 58 Boston-area men …

Testosterone (T) is thought to help facilitate trade-offs between mating and parenting in
humans. Across diverse cultural settings married men and fathers have lower T than other …

Objective Cross‐culturally, men's T declines in response to pairbonding and fatherhood, but
less is known about what happens to T during and after life history transitions that …

Across vertebrates, testosterone is an important mediator of reproductive trade-offs, shaping
how energy and time are devoted to parenting versus mating/competition. Based on early …

Male testosterone (T) decreases in response to childbirth. Longitudinal support for this has
come from samples across cultures. In this study, we look at individual differences in this …

In work presented in PNAS, Gettler and colleagues (1) make an important contribution to our
understanding of men's physiology. They find that, in a community-based sample from the …