MANY reasons: Female fertility is dependent on a fully functioning 'female' system. Hormone changes may cause lack of periods & no ovulation (e.g. Pcos, early menopause). Also any obstruction of the fallopian tubes may cause sterility (usual cause= untreated std's e.g. Chlamydia). Fibroid tumors may develop and hinder implantation. A woman may develop sperm anti-bodies (yes, it's possible). Other causes, too.
Answered 3/26/2013
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