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In Chapter 3, “From Mating to Conception,” author Robert Martin explores the question of why humans and other primates frequently engage in sexual intercourse when females are not fertile.

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image: Widening the Fertile Window

Widening the Fertile Window

By | July 1, 2013

Women may be able to store viable sperm for longer than a week, thus contributing to apparent variability in pregnancy lengths.

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image: Why Women’s Eggs Don’t Last

Why Women’s Eggs Don’t Last

By | February 13, 2013

As reproductive tissues age, DNA repair mechanisms become less efficient, causing genomic damage to accumulate.

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image: Ovulation Induced by a Nerve Growth Factor

Ovulation Induced by a Nerve Growth Factor

By | August 20, 2012

Researchers identify a nerve growth factor in semen that stimulates ovulation in certain mammals, and which could shed light on human infertility.

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image: Ovarian Stem Cell Debate

Ovarian Stem Cell Debate

By | July 9, 2012

Opinion is divided on a new paper showing that adult ovaries do not contain egg-making stem cells, contrary to the findings of two recent studies that themselves appeared to overturn longstanding dogma.

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image: Ultrasound Halts Sperm Production

Ultrasound Halts Sperm Production

By | January 30, 2012

Zapping testicles with ultrasound appears to reduce sperm counts to low levels in rats.

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image: The Risk of Aging Fathers

The Risk of Aging Fathers

By | August 30, 2011

Older male mice sired offspring that had more copy number mutations, including several linked to autism and schizophrenia.

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