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性取向是一种原因未明的生物学现象,包括异性恋、同性恋、双性恋与无性恋,长期以来一直受到心理学家、社会学家和生物学家的关注。在男性群体中,同性恋占有一定的比例。2010年美国公布的男男性行为者(men who have sex with men,MSM)约占美国总人口的2%~([1]);中国在2004年首次公布了同性恋的人数:男同性恋的人数为500~1000万~([2])。同性恋与AIDS、性病、肝炎等疾病的
Sexual orientation is an unknown biological phenomenon, including heterosexuality, homosexuality, bisexuality and asexuality, and has long been the focus of psychologists, sociologists and biologists. In the male population, homosexuality occupies a certain proportion. In 2010, the United States announced that men who have sex with men (MSM) account for about 2% of the total U.S. population. ([1]); China first published the number of homosexuals in 2004: the number of gay men was 500 ~ 10 million ~ ([2]). Homosexuality and AIDS, sexually transmitted diseases, hepatitis and other diseases