Yes, your sperm (or lack thereof) could certainly be the problem. It’s a little-known fact that in any instance of infertility, the problem is on the guy’s side about 40% of the time. The problem is on the woman’s side about the same—40%. The remaining 20% of cases have unknown causes.
You should see a doctor and get a semen analysis—it’s simple and it’ll tell you if you’ve got the normal amount of sperm in your semen and if they’re healthy. If there’s a problem, it could be caused by a variety of things, including:
• Medical problems such as enlarged veins in the scrotum, an infection, or obstruction of your ejaculatory ducts
• Obesity (it lowers your testosterone levels)
• Poor diet
• Use of steroids to enhance athletic performance
• Excessive smoking, alcohol use or drug use
• Genetic causes
The good news is that these days there are lots of ways for men with fertility problems to father children. But you’ll need a proper diagnosis to determine what option is best for you.