Parish el..al.,（2007) Parish,Laumann and Mojola(2007).Sexual Behavior in China:Trends and Comparisons,Population and Development Review,Vol.33,No.4, pp.729-756. CHLS(China Health and Family Life Survey) completed during 1999-2000 Nationwide survey;sample:3766;different cohorts(1950-60) 上海通大 SHANGHAI JIAO TONG UNIVERSITYParish el. al., (2007) Parish, Laumann and Mojola (2007). Sexual Behavior in China: Trends and Comparisons, Population and Development Review, Vol. 33, No. 4, pp. 729-756. • CHLS (China Health and Family Life Survey) completed during 1999-2000 • Nationwide survey; sample: 3766; different cohorts (1950-60)