Letters to the Editor
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correlation/causation
Do "confident, aggressive" women have five sons and no daughters because they are "confident and aggressive" from their high testosterone levels, or do they become that way from being around little boys (who are expected to be confident and aggressive)? Do "nurturing, caring" women have five daughters and no sons because they have low testosterone levels or because they spend all their free time playing Barbies with their girls?
BTW, my late grandmother, who certainly defined confident and aggressive, had four daughters. She miscarried her only son. Girls run very heavy on that side of the family, outnumbering boys about 2-1. You have to go over 150 years back to find a male firstborn, and among families with three or more children, my cousin was the first to have a male as her second-born in about 70 years. There is no shortage of confident, aggressive females in the clan.