By: Patricia L. R. Brennan Post-copulatory male-male competition is known as sperm competition a term coined by Parker (1970) who recognized that when females mate with multiple males, their ejaculates compete inside the female reproductive tract for access to eggs. Sperm competition has resulted in the evolution of morphologically modified sperm that increase the likelihood […]

In this book, best-selling author Robin Baker reveals these new facts of life: ten percent of children are not fathered by their “fathers;” less than one percent of a man’s sperm is capable of fertilizing anything (the rest is there to fight off all other men’s sperm); “smart” vaginal mucus encourages some sperm but blocks […]