the information-motivation-behavioral skills (imb) model of aids-preventive behaviour (fisher & fisher, 1992) was used to examine the relationships among aids-preventive knowledge, motivation, self-efficacy, and behaviour. gender was examined to determine whether it predicted self-efficacy and behaviour. sociosexual orientation was examined to determine whether it predicted self-efficacy and behaviour beyond gender. having greater knowledge was found to predict higher self-efficacy whereas higher motivation predicted more aids-preventive behaviours. gender predicted both selfefficacy and behaviour. females obtained higher selfefficacy and behaviour scores than males. females also tended to have more restricted sociosexual orientations than males. sociosexual orientation predicted behaviour but not self-efficacy. higher aids-preventive behaviour scores were predicted by a more restricted sociosexual orientation.