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An average penis measures 8-10 centimetres, and 13-15 centimetres when erect. The smallest erect penis ever recorded was only 1 cm, while the largest was 35 centimetres. The penis of a whale can measure 2.4 metres. Amongst primates, humans have the longest and widest penis. Gorillas, the largest primates there are, only have 4 cm long penises.