Smaller testicles make for better dads, suggests study

There are a lot of strange scientific studies going on, but this latest one that comes from the Emory University in Georgia will no doubt capture a lot of attention, and it regards how testicle size may play an important role to the day-to-day raising of children.

The study that was published in the journal Proceedings of the National Academy of Science was researching why some fathers spend less time in parenting than others, using the theory that people and animals are either built to breed or to nurture.

The findings found that men with smaller testicles were more involved in daily parenting activities.

The research involved 70 men living in the Atlanta area and aged between 21-43 , fifty were Caucasian, five were Asian and 15 were African-American, and all were the fathers of children aged one to two and lived with the biological mothers of their children.

The volume of the testes was measured by MRI scans and the researchers also analyzed testosterone levels, as previous studies have shown a link between high testosterone levels and less parental involvement.

Researchers also used MRI scans to analyze brain activitywhen the men were shown pictures of their toddlers and also of strangers' children, and then asked the fathers and mothers a series of questions to determine how involved they are as fathers.

The findings showed that men with smaller testicles not only received better parenting scores, they also showed more brain activity when they were shown pictures of their children, which suggests they are more nurturing fathers.

"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 diapers, bathing children, preparing meals, taking them to the doctor and things like that," said lead author James Rilling, an associate professor of anthropology.

"Even though some men may be built differently, perhaps they are willing themselves to be more hands-on fathers", continued Rilling. "It might be more challenging for some men to do these kinds of caregiving activities, but that by no means excuses them."

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