The evolutionary significance of penis size has been a topic for abundant speculation, often packaged with the myth that the human phallus is far bigger than in other primates. However, the human ...

Sometimes it pays to be average. A recent survey of 800 heterosexual women has revealed the preferred penis size for a partner — and it’s good news for fellas fearing their member mightn’t measure up.

Size of the human vagina In a rare discussion of female dimensions, in 2005 Jillian Lloyd and colleagues reported an average vagina length of just under four inches for 50 women, with extremes of ...