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WHY DOES INFERTILITY IN HUMANS HAPPEN?
 In males,problems with sperm,abnormalities of the reproductive organs .
 in females,problems with ovulation,damaged or blocked fallopian tubes,problems with cervical mucus,endometriosis,polycystic ovary syndrome,uterine fibroids etc.
Other factors are:
    age (both men's and women's fertility declines with age, although the decrease is more dramatic in women) emotional stress (which can affect hormone levels)
    poor nutrition, being overweight, exposure to toxic chemicals (such as lead and pesticides), certain medications, smoking, drug use, or excessive alcohol intake,  lubricant use and  certain medical conditions (e.g., cancer, diabetes, thyroid problems)


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