Even with advances in fertility treatments, in some cases doctors are still unable to pinpoint the reason behind infertility.  As a result, research into fertility continues.  In a recent finding, another potential piece of the fertility puzzle has been identified.  Our biological compatibility has an effect on human sperm function. Biological compatibility is a form of genetic compatibility between two people.  It’s comprised of HLA (or Human Leukocyte Antigen) genes which form part of our immune system.  In biological compatibility, the more different two people’s HLA genes are, the more likely they are to experience physical attraction.  The theory behind...