got this from a website... netwellness.org
"Certain drugs like the opiates (heroin, Vicodin, codeine, Tylenol #3 etc,) can have an effect on sperm morphology (the sperm having a normal or abnormal anatomy) and motility (the sperm swimming normally). These influences on sperm tend to have an "all or none" effect. In other works, these sperm are so abnormal that women tend not to become pregnant from these affected sperm. Women are also, therefore less likely to become pregnant if a large percentage of there sperm are abnormal."
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