Why Chimpanzees Have Big Testes, and Mandrills Have Small Ones
Why Chimpanzees Have Big Testes, and Mandrills Have Small Ones
For primates, males’ fancier ornaments are linked with smaller testes, according to a new comparative study.
Why Chimpanzees Have Big Testes, and Mandrills Have Small Ones
Why Chimpanzees Have Big Testes, and Mandrills Have Small Ones

For primates, males’ fancier ornaments are linked with smaller testes, according to a new comparative study.

For primates, males’ fancier ornaments are linked with smaller testes, according to a new comparative study.

sex
Larger Hermit Crab Penises May Prevent Shell Theft
Larger Hermit Crab Penises May Prevent Shell Theft
Abby Olena | Jan 16, 2019
Members of species with shells they must hold onto for survival have larger sexual tubes than those with less precious private property.
Men React to Repeated Painful Experiences Differently than Women Do
Men React to Repeated Painful Experiences Differently than Women Do
Diana Kwon | Jan 14, 2019
Men’s pain tolerance decreases when exposed to a setting where they’ve previously had a painful experience.
Trump Administration’s Definitions of Sex Defy Science
Trump Administration’s Definitions of Sex Defy Science
Ashley P. Taylor | Oct 23, 2018
The government wants to limit a person’s sex to male or female as determined by genitalia at birth and genetics. It’s not so simple, say scientists.
Genetic Risk Factor for Erectile Dysfunction Identified
Genetic Risk Factor for Erectile Dysfunction Identified
Ashley P. Taylor | Oct 9, 2018
Researchers believe the genetic locus affects the regulation of another gene involved in sexual function.
Fruit Fly Geneticist Bruce Baker Dies
Fruit Fly Geneticist Bruce Baker Dies
Diana Kwon | Jul 30, 2018
The Stanford University professor was known for his work on sex determination and courtship in flies.
 Researchers Look to Sex Pheromones to Trap an Invasive Snake
Researchers Look to Sex Pheromones to Trap an Invasive Snake
Steve Graff | Jul 1, 2018
The brown tree snake has wreaked havoc on the island of Guam, but one solution to the problem could lie in the serpent’s own physiology.
Fast-Tracking Sexual Maturation
Fast-Tracking Sexual Maturation
Ruth Williams | Nov 1, 2017
The brains and bodies of young female rats can be accelerated into puberty by the presence of an older male or by stimulation of the genitals.
Sexual Touch Promotes Early Puberty
Sexual Touch Promotes Early Puberty
Ruth Williams | Sep 21, 2017
The brains and bodies of young female rats can be accelerated into puberty by the presence of an older male or by stimulation of the genitals.
Snake Sex Determination Dogma Overturned
Snake Sex Determination Dogma Overturned
Abby Olena | Jul 6, 2017
Researchers find that boas and pythons use an XY sex chromosome system, rather than the previously assumed ZW system found in some other snakes.