目的：本文探討台灣民眾的性行為，分析世代、性別、教育、婚姻狀態的交互影響，並與中國和美國的調查做比較。方法：資料來源是2002 年台灣社會變遷基本調查，樣本數共計1,790 人，女性927 人，男性863 人，年齡19-71 歲。結果：過去一年沒有性伴侶是三成五，有一位性伴侶是六成，有兩位或以上性伴侶的男女是7%、0.5%；過去一年每週至少行房一次是三成，以已婚者最多；四成二表示首次性經驗發生在20 至25 歲間。在單身男、女中，各有38.9%、65.9%從未有過性經驗，性行為的性別差異在六、七年級世代逐漸縮小，但大學或以上學歷者首次性行為初始年齡仍顯著較高。約四成、二成的男性去過色情場所、有過性交易。相較美國人，台灣人初始性行為年齡較高、前一年沒有性活動比例高出許多、單身男女的性經驗差距仍大。與中國最大的差異是25 歲以上台灣人口中，從未有性經驗的比例高出甚多。結論：台灣2-7 年級世代尚未出現20 世紀後半葉美國社會性革命的洗禮，與中國人性行為變遷比較則需更多研究資料映證。

Purpose: This paper examines the sexual behavior of Taiwanese men and women aged 19 to 71. We discuss how sexual practices intersect with social factors such as gender, age, cohort,education, and marital statusto produce different outcomes among our respondents. Results arecompared with American and Chinese surveys. Methods: Data were drawn from the Taiwan Social Change Survey (2002), a national face-to-face survey. The sample size is 1,790 respondents (Male=863, Female=927). Results: For the total respondents, 35 percent reported having no sexual partner within the past twelve months, 60 percent have had only one partner,and 7 percent of men and 0.5 percent of women reported having two or more partners. About 30 percent of the total number had sex at least once a week in the last year, and among them, married people have the highest rate. The modal age of our respondents’ first instance of sexualintercourse was between age 20 and 25. About 65 percent of single women and about 40 percent of single men had never had sex at all. College education was negatively associated with age at first sexual intercourse. Gender differences in premarital sex and the age of the first sex actamong generations were intersected by educational level, but the gap has been closed among young people. Of men, roughly 40 percent had visited sexual establishments and about 20 percent admitted having purchased sex. In comparison with Americans, Taiwanese respondents reported having first-time sex at a much later age, and a much higher rate of having no sexual partner in the past year. The gender gap in both premarital andadolescent sex among Taiwanese was still significant. Comparing with their Chinese counterparts, our Taiwanese respondents age above 25 also had a higher rate of being sexually inexperienced. Conclusion: The so-called sexual revolution that has reshaped the sexual behavior of Americans since the late 20 century has not yet occurred in Taiwan. A solid comparison of changing sexual behavior among Taiwanese and Chinese requires further research.