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So I guess you're meaning that the study showed that this is the reason why men can be attracted to other men?
No, you can't show that. The study showed that most gay males (74% of the subjects) had a female type of brain (ratios in the cell population of the cerebelum, size of the chambers etc...). Now to say that it was because of that that they were attracted to men, you need other experiments, like feminising a male brain and verify his sexual behavior etc... which is hard to do and not very ethic. The study was an epidemiologic study which like all epidemiologic study can only gives clues and not proof.