Sperm Wars

Infidelity, Sexual Conflict, and Other Bedroom Battles


By Robin Baker

Read by Jessica Wolf

Formats and Prices

This item is a preorder. Your payment method will be charged immediately, and the product is expected to ship on or around October 6, 2020. This date is subject to change due to shipping delays beyond our control.

This classic work on the rules of sex — updated for a new generation — is still as provocative as the day it was published, providing simple explanations for any and all questions about what happens in the bedroom.

Sex isn’t as complicated as we make it. In Sperm Wars, evolutionary biologist Robin Baker argues that every question about human sexuality can be explained by one simple thing: sperm warfare. In the interest of promoting competition between sperm to fertilize the same egg, evolution has built men to conquer and monopolize women while women are built to seek the best genetic input on offer from potential sexual partners.

Baker reveals, through a series of provocative fictional scene, the far-reaching implications of sperm competition. 10% of children are not fathered by their “fathers;” over 99% of a man’s sperm exists simply to fight off all other men’s sperm; and a woman is far more likely to conceive through a casual fling than through sex with her regular partner.

From infidelity, to homosexuality, to the female orgasm, Sperm Wars turns on every light in the bedroom. Now with new material reflecting the latest research on sperm warfare, this milestone of popular science will still surprise, entertain, and even shock.


  • "Riveting"
    The Times (UK)
  • "The best fiction I've read all year is the imaginary sex scenes in Robin Baker's Sperm Wars, the most entertaining science book of the year."
    The Sunday Times (UK)
  • "A constant stream of surprising facts makes this an entertaining page-turner ... A must for anyone who wants to understand what is really going on during sex."
    The Irish Times
  • "A fascinating book for bedtime -- or any other time ... eye-opening ... a worthwhile, absorbing read."
  • "Challenging, intellectually provocative and likely to raise considerable and deserved debate."
    Publishers Weekly

On Sale
Oct 6, 2020
Hachette Audio

Robin Baker

About the Author

Robin Baker is a bestselling author in the field of sexual biology. From 1980-96 he was Reader in Zoology in the School of Biological Sciences at the University of Manchester, and he has over a hundred scientific papers and magazine articles to his name. His work and ideas on the evolution of human behavior have been featured in many television and radio programs around the world. He lives in Spain.

Learn more about this author