(Ancient sex toy: Archaeologist Petra Kieselbach with the stone find)
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This prehistoric sex toy proves that cavemen and women were more open-minded than we first thought.
It's believed the 28,000-year-old smooth stone phallus - made from 14 different pieces of silt-stone - was used by sexually-adventurous cave dwellers.
Discovered in a cave near Ulm in Germany in 2005, it's thought to be one of the earliest sex aids ever discovered.
It forms part of the Institute of Sexology exhibition at the Wellcome Collection in London.
The exhibition uses objects, documents and research to chart the history of the evolving relationship between mankind and sex.
It includes some of the earliest sex aids, sexual imagery and the ground-breaking work of sexologists such as Sigmund Freud, William Masters and Virginia Johnson.