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In 1992, Bailey and Pillard followed-up their experiment on homosexual men by studying identical twin, fraternal twin, and nongenetically related adopted sisters. As expected, their results mirrored those found in their gay brother study. Whereas only six percent of adopted sisters were both lesbian, sixteen percent of fraternal twin sisters and forty-eight percent of identical twin sisters were both lesbian (Burr, Separate 35). Clearly, the basis for a similar argument for predetermined homosexuality in women has been laid.