Women’s Cervical Mucus Prefers Some Sperm Over Others 
Women’s Cervical Mucus Prefers Some Sperm Over Others 
In human male-female pairs with a less similar suite of genes for human leukocyte antigens, sperm fare better when exposed to cervical mucus.
Women’s Cervical Mucus Prefers Some Sperm Over Others 
Women’s Cervical Mucus Prefers Some Sperm Over Others 

In human male-female pairs with a less similar suite of genes for human leukocyte antigens, sperm fare better when exposed to cervical mucus.

In human male-female pairs with a less similar suite of genes for human leukocyte antigens, sperm fare better when exposed to cervical mucus.

cryptic female choice
The Hidden Side of Sex
The Hidden Side of Sex
Patricia L.R. Brennan | Jul 1, 2014
Sexual selection doesn’t end when females choose a mate. Females and males of many animal species employ an array of tactics to stack the deck in their reproductive favor.