sculpted and polished phallus found in a German cave is among the earliest representations of male sexuality ever uncovered, researchers say.

The 20cm-long, 3cm-wide stone object, which is dated to be about 28,000 years old, was buried in the famous Hohle Fels Cave near Ulm in the Swabian Jura.

The prehistoric "tool" was reassembled from 14 fragments of siltstone.

Its life size suggests it may well have been used as a sex aid by its Ice Age makers, scientists report.