During the year-long study, images of the brains of homosexual men and women were compared after they sniffed male and female pheromones (substances deried from sex hormones).

• 在历时一年的研究中，他们比较了男性和女性同性恋者闻到雄性和雌性信号(来源于性激素的物质)后大脑的影像，作出了这一结论。