Hey Gail
Although the link between (uncontrolled) diabetes on female infertility is well established the same can not be said for male infertility.
Diabetes may often cause erectile dysfunction or retrograde ejaculation in males but none of these would stop something like IVF from working.
One study, which was based on a limited sample though, suggested that the sperm of diabetic men although appeared normal under the microscope, exhibited a higher degree of DNA abnormalities than their non diabetic counterparts. Such abnormalities could lead to difficulty in conceiving.
The good news is that the better controlled glucose levels are the higher the chances of success.
Good luck.
Pavlos
