Many Things: Sometimes sperm production is decreased. Blockages can occur in the testicle preventing sperm from being released. Sometimes there can be genetic reasons. Smoking can damage sperm which can cause them to be genetically abnormal or to cause physical defects in the sperm. There are a number of problems that can occur and most can be fixed.
Answered 8/2/2013
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A doctor has provided 1 answer
A doctor has provided 1 answer
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