Contrary to the well-documented notion that positive verbal responses reinforce behavior, research on physical pleasuring has demonstrated that positive verbal 'responsiveness from a recipient of pleasurable vibrations inhibits, rather than facilitates, heterosexual pleasuring. The present research sought to clarify the role of recipient responsiveness in interpersonal pleasuring through comparison of established dating couples with ad hoc pairs. Using the pleasure paradigm developed by Davis, Rainey, and' Brock, 160 undergraduate couples-either established dates or ad hoc pairs-delivered intensity-graded pleasurable vibrations to the buttocks and thighs of a recipient. It was proposed that among dating couples, intimacy would be perceived as appropriate; hence, responsiveness would facilitate rather than inhibit pleasuring. In the case of strangers, however, it was expected that intimacy would be perceived as inappropriate; hence, responsiveness would not facilitate pleasuring. Results offered support for these predictions.The ubiquitous human propensity to give and receive physical pleasure has recently become the object of systematic empirical research. Using the pleasure machine developed by Davis, Rainey, & Brock (1976), with which subjects administer pleasant vibrations to an experimental confederate rather than electric shock (e.g., Buss, 1961), investigators have explored the effects of such variables as sex combinations, recipient attractiveness, liking, anticipated future interaction (Davis et al., 1976), recipient responsiveness (Davis et al., 1976; Davis & Brock, Note 1), recipient status (Davis & Brock, Note 1), relationship meaningfulness (Cacioppo, Note 2), and perceived appropriateness of pleasure giving (Thomas, Canty, Geva, & Brock, Note 3) on the administration of physical pleasure. Special thanks are due Timothy C. Brock for his comments on previous drafts of this article. We would also like to thank Thomas M. Ostrom and Robert S. Wyer, Jr. for their comments.