“…The question of whether volunteers for human sexuality research are different from nonvolunteers has generated considerable research (Barker and Perlman, 1975;Bauman, 1973;Bogaert, 1992;Farkas et al, 1978;Kaats and Davis, 1971;Kenrick et aL, 1980;Morokoff, 1986;Nirenberg et aL, 1991;Saunders et al, 1985;Wolchik eta!., 1985Wolchik eta!., , 1983o This is understandable be-cause this research question addresses concerns about the generalizability of sexual surveys, that is, the extent to which participants in sexual research are biased, self-selected, and do not represent the population of interest.…”