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There are many causes for a sperm being defective. Some of the leading causes are:

  • Advanced paternal age
  • Sperm from masturbation tends to be more defective than sperm from sex
  • Increased testicular heat
  • Physical trauma to the testicles or scrotum
  • Some chemicals
  • Certain medications
  • Exogenous hormones
  • Smoking
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15y ago

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