本研究為探討影響臺灣男同性戀者之自我效力、自覺愛滋病威脅與其性行為之相關因素，以作為防治愛滋病在男同性戀羣體流行之參考依據。採立意取樣之橫斷面樣本調查法，以結構式問卷及抽血檢查HIV-1血清抗體收集108位男同性戀者之資料，84位接受HIV-1血清抗體篩 檢，8位HIV-1抗體呈陽性反應，整體陽性率為9.5%。研究結果如下: (1)臺灣男同性戀的性行為，約74.1%( 80/10 )的男同性戀者曾採取肛交行為，使用保險套的比率偽低，約10.2%-12.0%的人在肛交時每次都用保險套。性伴侶人數差異很大，一生性伴侶從1位到999位不等，一年性伴侶數從1位到120位不等。(2)男同性戀者之自我效力與其性伴侶人數及性行為有顯著的相關。(3)男同性戀者其自覺愛滋病威脅程度與其性行為無關。(4)「與性伴侶維持月數」、 「一年同性伴侶人數」、「教育年數」、「有無固定性伴侶」、「是否做過愛滋病檢查」、「第一次性交年齡」、「性交前喝酒頻率」七個因素可有效預測男同性戀一生之同性性伴侶人數，解釋力達48.4%。 (5)「自我效力」、「第一次性交時有無肛交」、「一年同性性伴侶人數」、「有無固定性伴侶」四因素可有效預測男同性戀者之危險性行為，解釋力達27.51%。

The purposes of this study were to investigate the relationship between the self-efficacy, perceived AIDS threat, and sexual behaviors among the male homosexuals in Taiwan. A cross-sectional survey was conducted between Octorber 1994 and March 1995 among 108 male homosexuals. Data were collected by self-administered, anonymous questionnaire, and whole blood. The mean age of all respondents was 25.S±6.0 years, of 84 (77.8 %) subjects who had been HIV-1 serum antibody tested, 8 (9.5% )were HIV-1 antibody positive. The following results were obtained (1) 74 % (80/108)of respondents reported engaging in anal intercourse within the past year. 10.2% -12.0% of the men reported that they always used condoms during anal intercourse. The mean number of partners over the subjects' lifetimes was 53.26 (range, 1-999) and the mean number of years of homosexual partners was 12.S0 (range, 1-120) . (2) Self-efficacy of subjects was strongly associated with the number of sexual partners and sexual behaviors. (3) Perceived AIDS threat was not associated with the sexual behaviors of the subjects. (4) Multiple regression analysis explained 48.48% of the following variables in the number of lifetime partners: the number of months of with the same sexual partner, the number of partners per year, years of education, monogamous or not, having ever been HIV tested, age of first sexual activities, and alcohol consumption before sexual activities. (6) Multiple regression analysis explained 27.51 % of the following variables in risky sexual behaviors: self-efficacy, anal intercourse of the first sexual behaviors, the number of partners per year, and monogamous or not.