Prostitution in Overseas France were female, 20% male and 50% transsexual (known as "raerae"). When Captain Samuel Wallis discovered Tahiti in 1767, he traded with the islanders for fresh provisions. The Polynesians had no source of iron, and the women sold sex for nails. Wallis had to ban shore leave for the crew for fear of the ship collapsing as so many nails had been removed from the structure. When Captain Cook arrived in 1769, the price had risen from one nail to three nails. By the time of Cook's 3rd visit in 1774, the currency had changed from nails to European clothes and
British Empire 1853 and to Western Australia until 1868. The Australian colonies became profitable exporters of wool and gold, mainly because of gold rushes in the colony of Victoria, making its capital Melbourne for a time the richest city in the world and the second largest city (after London) in the British Empire. During his voyage, Cook also visited New Zealand, first discovered by Dutch explorer Abel Tasman in 1642, and claimed the North and South islands for the British crown in 1769 and 1770 respectively. Initially, interaction between the indigenous Māori population and Europeans was limited to the trading of goods.