| According to 《Chinese Catalogue of Mental Disorder-III》 , homosexuality is defined as showing persistent sexual disposition in the aspects of thinking, emotion and sexual behavior towards the same sex under normal living conditions, but has no or reduced tendency towards the opposite sex, whether have normal sexual behavior to opposite sex or not. In the past 10 years, starting from October 1994, we have studied the population, sexual behavior features, neurobiological and neuropsychological characteristics of sexual orientation of male homosexuals in China.With fixed-point observation and capture-recapture method, we had investigated the male homosexual population twice; by using the testing kit provided by DPC company (U.S.A.) and radioimmunoassay (RIA), we had determined the serum level of sex hormones including TT, E2, PRL, FSH and LH in the male homosexuals, and compared the results to control; by using Wechsler Adult Intelligence Scale (WAIS-RC), we had assessed the intelligence status of the male homosexuals, and compared the results to control to analyze and comprehend the intelligence structure and sexual orientation of male homosexuals; by using Minnesota Multiphasic Personality Inventory (MMPI), we had measured the personality of the male homosexuals, and compared the results to control to understand the mental health level of male homosexuals, besides, we had also performed the MMPI common factors analysis relating sexual disposition of the male homosexuals; by using the video-computer assisted experimental system for observation of sexual preference and sexual behavior of rats, we had studied the effects of exogenous sex hormones before brain sexual differentiation on sexual orientation and hypothalamic sexually dimorphic structures.The results of present research showed that (1) The emergence rate of male homosexuals in the population is 0.58%, therefore it is presumed that the proportion of male homosexuals population exceeds 1 %~2%; (2) The serum levels of androgen in the male homosexuals were much lower than the male control, moreover, the TT/E2 ratio is also lower than the male control; (3) The intelligence structure of male homosexuals with verbal intelligence predominated showed similarity to female control, on the other hand showed significant difference to male control; (4) Male homosexuals intended to manifest the psychological reacting patterns that similar to female when facing problems, as well as displayed self-denial/seeking-help as the first reacting pattern, while the male control displayed contend/challenge as the first psychological reacting pattern; (5) Mental health level of male homosexuals obviously declined. MMPI scores indicated that among the 10 clinical scales, male homosexuals had T-scores greater than 70 in 6 scales which including depression (D), psychopathic deviate (Pd), masculinity-femininity (Mf), paranoia (Pa), schizophrenia (Sc) and psychosthenia (Pt), this revealed the degression of mental health level in male homosexuals; (6) Male homosexuals were having great number of sex partners: each male homosexual generally had sexual behaviors towards 7.34 + 5.61 male homosexual partners in one year; (7) Male homosexuals lacked in knowledge on the health condition of sex partners, only 13.70% of the participants in our survey understood the health conditions of their partners, which mainly notified by the partners; (8) The major sexual behaviors for male homosexuals towards same-sex partners were inter-masturbation, oral sex and anal sex, in proper order. Very few of them had oral-anal sex. While the main sexual behavior for them towards opposite-sex partners was vaginal sex, many of them also had anal sex, oral sex and inter-masturbation; (9) Only 11.11% of the male homosexuals used condom each time when they were having anal sex, most of the male homosexuals rarely or never used safety measure when having sex with same-sex partners, furthermore, they mostly ignored protective when having sex with opposite-sex part...
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