Testicular volume is inversely correlated with nurturing-related brain activity in human fathers User Mad_Chemist_, in the Reddit Science subreddit, 22 Mar 2021
TIL That both testosterone levels and testicle volume were negatively correlated with paternal caregiving. This suggest that the biology of human males reflects a trade-off between mating effort and parenting effort. User bhaggith, in the Today I Learned (TIL) subreddit, 01 Feb 2021
TIL that according to a study from the Emory University in Atlanta, men with smaller testicles are probably better at childcare. User Banekan1, in the Today I Learned (TIL) subreddit, 20 Jan 2016
Testicular volume is inversely correlated with nurturing-related brain activity in human fathers User the_liebestod, in the Social Justice Research subreddit, 15 Sep 2013