The effect of stimulus content on volunteering for sexual interest research among college students

Much of the literature on volunteer bias in sexual interest research has been limited to either identifying variables on which volunteers differ from nonvolunteers or examining how the intrusiveness of the measurement device affects volunteer rates. The present study was designed to examine whether stimulus content would affect volunteer rates and volunteer/nonvolunteer differences in a large sample of college students (206 men and 358 women). The study also sought to determine whether such findings could also apply to research that recruits from exclusively heterosexual samples. Students completed questionnaires in small groups and were asked whether they would be willing to volunteer for studies that would involve viewing and rating five different types of sexually explicit images (nude men, nude women, heterosexual behavior, male homosexual behavior, and female homosexual behavior). Results indicate that men and women differed in the types of images that they would volunteer to view, based upon the content of the images. Furthermore, volunteers for each type of image reported significantly greater self-monitoring as well as sexual and general sensation seeking than did nonvolunteers, while differences on other measures were less consistent. Discussion is given to specific ways in which the findings and generalizability of sexual interest study results can be affected.