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Men with smaller testes are more likely to be involved in hands-on care of their toddlers, a new study by anthropologists finds. Smaller testicular volumes also correlate with more nurturing-related brain activity in fathers. The data suggest that the biology of human males reflects a trade-off between investments in mating versus parenting effort.


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Although statistically significant, the correlation between testes size and caregiving was not perfect.

"The fact that we found this variance suggests personal choice," Rilling says. "Even though some men may be built differently, perhaps they are willing themselves to be more hands-on fathers. It might be more challenging for some men to do these kinds of caregiving activities, but that by no means excuses them."
Yeah, in b4 generalizations that overlook that fact.
 
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