Believed critical for determining which individuals can -- or cannot -- successfully reproduce with each other, genitalia not only figure prominently in the origin of new species, but are also ...

As far as evolution is concerned, genital size doesn't matter — but shape does. Genitalia are important in the evolution of new species, since compatible parts are necessary for two individuals to ...

Surprising pattern: The genetic programmes responsible for the development of sex-specific organ characteristics in mammals are turned on almost exclusively late in the development of the organs, in ...

Many men are experiencing issues with the size of their male sex organ that causes them to feel embarrassed in bed, a problem separate from erectile dysfunction. Research from the Netherlands shows ...

Biological sex is usually described in simple binary terms: male or female. This works well for germ cells (sperm versus eggs), but for other body organs it is of little help. A new study now shows: ...

• Only sexual organs show clear separation: In all other organs, male and female gene activity patterns overlap. • Human differences are weaker: Compared to mice, the differences are smaller and ...