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  Studies on fruitflies have shown that certain mutations in a fly’s genes affect its sexual orientation or likelihood to engage in heterosexual or homosexual activities. The kinds of mutations, and their influence on behavior, vary. Mutations can cause male fruitflies to court females and other males indiscriminately. Other mutations cause males to pursue other males exclusively. More strangely, genetic mutation can cause male fruitflies to engage in bisexual activity only when exposed to light.Source:Bisexual flies. Preiser, Rachel; Discover, v. 17 (Jan. 1996) p. 83. [Feature article]

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http://www.pbrc.hawaii.edu/bemf/microangela/dros.htm