When the early 19th-century scientist Thomas Malthus contemplated ways of reducing the population before it outstripped the food supply, he considered infanticide, murder, contraception, starving the poor and homosexuality. The latter has been harnessed by present-day scientists to halt an explosion, not of people, but of brown-tailed moths.

Moths and their larvae have multiplied in such numbers in some parts of the country recently that they have become a menace to people. Experts have come up with the novel solution of tricking the males of the species into thinking that they are gay................

Scientists keep moths in check by persuading males to be gay - Times Online