Eau de Daddy Means Later Periods

The pheromones produced by biological fathers may influence a girl’s sexual maturity
Your dad is a man whose babies you do not want to bear. It is gross, criminal in many countries, and would be genetically ruinous for your consanguineous offspring.

What’s more, this ancient evolutionary no-no seems to have startling modern day implications for female maturation. A study of 2,000 US college girls published in the American Journal of Human Biology in July 2006 shows that daughters who grow up without their fathers tend to have their first period earlier than those who blossom under their dad’s wing. Robert Matchock, who led the retrospective survey at Pennsylvania State University Altoona, believes there is a mechanism at play here that helps prevent inbreeding.

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