是那种不寻找（或者还没有找到）长期稳定性伴侣，和单身但是非同性恋，常换性伴侣的一样。不过“雌雄双吃”，这次是个BOY，下回是个GIRL，为人津津乐道。：）这是种性行为。
很多同性恋有长期伴侣，与异性婚姻无异。
同性恋是个社会学中的热点。关于大脑结构，我曾经读过一篇文章，不过出处已不记得了。随手找了这么个原始的报道：
In 1991 Dr. LeVay, a neuroscientist at the Salk Institute of La Jolla, California, examined the brains of 41 cadavers: 19 allegedly homosexual men, 16 allegedly heterosexual men, and six allegedly heterosexual women. His study focused on a group of neurons in the hypothalamus structure called the interstitial nuclei of the anterior hypothalamus, or the INAH3.
He reported this region of the brain to be larger in heterosexual men than in homosexuals; likewise, he found it to be larger in heterosexual men than in the women he studied. For that reason, he postulated homosexuality to be inborn, the result of size variations in the INAH3, and his findings were published in Science in August of 1991.
另外也有双胞胎的研究等：http://en.wikipedia.org/wiki/Biology_and_sexual_orientation
很多同性恋有长期伴侣，与异性婚姻无异。
同性恋是个社会学中的热点。关于大脑结构，我曾经读过一篇文章，不过出处已不记得了。随手找了这么个原始的报道：
In 1991 Dr. LeVay, a neuroscientist at the Salk Institute of La Jolla, California, examined the brains of 41 cadavers: 19 allegedly homosexual men, 16 allegedly heterosexual men, and six allegedly heterosexual women. His study focused on a group of neurons in the hypothalamus structure called the interstitial nuclei of the anterior hypothalamus, or the INAH3.
He reported this region of the brain to be larger in heterosexual men than in homosexuals; likewise, he found it to be larger in heterosexual men than in the women he studied. For that reason, he postulated homosexuality to be inborn, the result of size variations in the INAH3, and his findings were published in Science in August of 1991.
另外也有双胞胎的研究等：http://en.wikipedia.org/wiki/Biology_and_sexual_orientation
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