via Huffington Post
Men with larger testicles tend to be less involved fathers than those with smaller testes, a new study suggests.
The findings, detailed yesterday in the journal Proceedings of the National Academy of Sciences, are correlational, so they can’t say exactly why the trend exists but only that there is a link.
But men who produce more sperm have bigger testes, and sperm production is extremely energy intensive for the body, so it may be that fathers “face a trade-off between investing energy in parenting and investing energy in mating effort,” said study co-author James Rilling, an anthropologist at Emory University in Atlanta.
They just make up studies about anything these days.