You can easily see how a small "malfunction" in any one of these steps can result in the failure of the egg to get fertilized.
It's customary when you think of infertility to automatically assume that the problem lies with the female reproductive system. But, you may be surprised to learn that the cause of infertility on average is equally found in females and males alike.
In about 40 percent of the cases, in fact, the failure to get pregnant lies with the man. In another 40 to 50 percent, the problem is with the female reproductive system. And surprisingly, for up to 20 percent of the couples, the problem involves both partners in some way.
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