Glad you are putting your time to good use, tony. lol
There are all sorts of reasons, but this one is pretty interesting. Interesting that anybody would try to investigate the link between the two.
Smaller Testicles, Better Dads
This may be a stretch, but dads who stick around for their kids seem to be the ones with smaller testicles. A study from Emory University interviewed 70 dads with 1- or 2-year-old children. Both father and mother were interviewed about the dads’ involvement in child rearing, including how often they changed diapers, bathed the child, or took them to the doctor when they were sick. They also measured the fathers’ testosterone levels.
Their results showed that dads who were more involved tended to have lower testosterone and thus smaller testicles. “We’re assuming that testes size drives how involved the fathers are,” anthropologist Dr. James Rilling said. “But it could also be that when men become more involved as caregivers, their testes shrink. Environmental influences can change biology. We know, for instance, that testosterone levels go down when men become involved as fathers.”