He should start by asking his doctor to do a sperm count. If there are other issues he can discuss them with the doctor.
The fact that you have not gotten your wife or gilfriend pregnant doesn't mean that you can't have kids or that your sperm is not strong enough.
Believe me when I tell you this, because my husband and I tried for about 7 years to get pregnant. We were both tested and nothing was wrong with either of us. We were just not having sex during the right time. There is only about 4 or 5 days month that a woman can get pregnant. I went to babycenter.com and found out about what time of the month was my most likely I would be able to conceive.
It took 4 months for this to work for me but work it did so after trying for 7 years we are pregnant.
From the previous answer there is obviously a history behind this question I do not know about so I will answer this question as asked.
The first thing to do is get a sperm count. Even a low sperm count does not mean you are INfertile, just SUB fertile.
Even if there is apparently no problem with either of you and you are having sex a the right time sometimes the woman just does not get pregnant, something in her body chemistry kills the sperm and/or the embryo before it implants.
IVF might be an option in this case.
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