One thing I KNOW for sure is that infertility can also be due to poor eating habits, etc. I've done some research and counseling on this issue. It makes sense. If your body does not have the appropriate nuturients to handle the pregnancy or fertilize an egg (could be either party or both) then it's not going to.
You see this MORE & MORE all the time. The MORE people's eating habits go to the toilet, the more infertility issues we have. How many problems did people have 10 vs. 20 vs 30 years ago?
CERTAINLY something that needs looking into. There are specific foods that "feed" the male reproductive system as well as the female's. In addition, you HAVE to stay away from chemicals....food additives, preservatives, etc. DETOX, if you've never done that. It's a great thing to do no matter what and it CERTAINLY can't hurt. AND......it's ALOT less expensive than fertility drugs and/or invetro!