Testicle size a predictor for parenting style?

The research involved 70 US men of varying ethnicities – most were Caucasian, five were Asian and 15 were African-American. All were the fathers of children aged one to two.

The larger the volume of their testes, the less the men were involved in daily parenting activities like changing nappies, said the study by researchers at Emory University in Georgia.

In comparison, men with smaller testes showed more nurturing activity in the brain when shown pictures of their children, and also were more involved in their children's upbringing, according to surveys answered separately by both the fathers and their female partners.

All the men in the study were aged 21–55 and lived with the biological mothers of their children. Most were married.

"I wouldn't want to say that men with large testes are always bad fathers but our data show a tendency for them to be less involved in things like changing nappies, bathing children, preparing

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