Further light is thrown on homosexuality in Australia by the supposition of Spencer and Gillen that the mika operation (urethral subincision), an artificial hypospadias, is for the purpose of homosexual intercourse. Klaatsch has discussed the homosexual origin of the mika operation on the basis of information he received from missionaries at Niol-Niol, on the northwest coast. The subincised man acts as a female to the as yet unoperated boys, who perform coitus in the incised opening. Both informed Klaatsch in 1906 that at Boulia in Queensland the operated men are said to "possess a vulva."