There has been some recent evidence for low sperm counts in men whose mother's were exposed to more than 7 beef meals per week when pregnant. I believe that while the evidence is scant, it is there and the phenomenon may be related to the usage of growth hormone and other androgens in cattle. See attached link here.
On another related, and perhaps scarier note, pediatricians have been noting a rise in breast development in girls less than 10-11 years of age. These pediatricians have told me that they feel the problem comes from estrogen in industrial raised chicken and recommend that parents purchase hormone free chicken and other meat. Makes sense to me.