MARRIED men who spend time with their wives and kids have lower testosterone levels than bachelors. The discovery suggests that having less of the hormone could play a part in encouraging men to devote their energies to the family rather than looking for another partner.
In male birds from monogamous species, testosterone levels fall after they form a pair and start taking care of their young. Artificially raising levels of testosterone is known to cause the males to play the field at the expense of parenting. This suggests that testosterone boosts competition for mates while lower levels encourage fatherly conduct.…
