are busy wasting government grant money on such a "research."
As usual, affirmative-action quality "scientists" can only speculate. Some say obesity, some say chemicals. I say - more free time and masturbation.
But few realize the issue is not simplistic. For example, higher testosterone level shuts down sperm production. Shhhh, wait, not a word more. We need another 5-year government grant to research that.