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Researchers believe that women stay away from male relatives when they are most fertile for evolutionary reasons.
How does a father's age affect fertility and a baby's health?, Aging, Men's Health, Your Pregnancy Matters
Black women are more likely to experience infertility than white
Attention, Dads: Your Health and Lifestyle Affect Baby, Too, UNM Health Blog
Why have four children when you could have seven? Family planning in Niger, Working in development
Fertility awareness - Wikipedia
The Risks to Babies of Older Fathers - The New York Times
Ovulation calculator - Flo Health
The world's most fertile woman had 69 children: Who is Valentina
How To Calculate Safe Period To Prevent Pregnancy?
How alcohol affects fertility