“…Although data on generational changes in sexual behaviors is limited, initial studies in both Europe and the U.S. suggest that the age of sexual debut has decreased and the lifetime number of sexual partners has increased over the past several decades (Agius et al, 2010; Aral et al, 2005; Bajos et al, 2010; Herlitz, 2009; Satterwhite et al, 2007; Turner et al, 1995). For example, studies in the U.S. suggest the proportion of women who reported having sex before age 18 increased from <10% in 1900–1920’s to 25% during the 1930–40’s, 45% in 1950–60’s, and 60% in the 1970’s (Turner et al, 1995).…”