IT’S WORSE IF YOU CARRY AROUND ONE OF THOSE FLOWER-PRINT DIAPER BAGS: Study: Fatherhood Can Lead To Drop In Testosterone. “Testosterone, that most male of hormones, takes a dive after a man becomes a parent. And the more he gets involved in caring for his children — changing diapers, jiggling the boy or girl on his knee, reading ‘Goodnight Moon’ for the umpteenth time — the lower his testosterone drops. So says the first large study measuring testosterone in men when they were single and childless and several years after they had children. Experts say the research has implications for understanding the biology of fatherhood, hormone roles in men and even health issues like prostate cancer.”