Thanks will look into it :)
Lots of discussion regarding diabetes and infertility in men. Most say diabetes "may" or "can cause" infertility, including "they suggest" but no mention of who "they" is. A few mention "studies show" but again no name of study to research the so-called study. Bottom line, nothing is conclusive. Your partner needs to see a fertility specialist, usually a Urologist, who will perform a physical examination to determine if there are any true cause/s. You and/or he can look this over - Infertility in men - Diagnosis:
http://www.umm.edu/patiented/articles/what_causes_of_male_infertility_000067_4.htm