So they compared the intelligence battery testing to three semen measures - sperm concentration, sperm count, and sperm motility. So that allowed them to make the statement that the strongest influence on intelligence differences in adulthood is genetic. Because where are we right now? It's one of those things where you're going to have to make a judgment on how you feel about this particular methodology. Intelligent 'have better sperm'. But it does seem that there are studies about this, because women who have gone to clinics looking for a sperm donor do look for these factors. But this was an interesting aspect of these findings, too.
It comes up a lot.
Smart Guys Have Better Sperm
And they had very good sperm. And we would like to invite you along for this little journey that we took. But again, like we said, we have to look at the methodology. A team from the Institute of Psychiatry analysed data from former US soldiers who served during the Vietnam war era. And of those, at the time, had provided semen samples. And that is a variable that is used across the board in terms of this fitness quality known as intelligence.