Public health agencies have insufficient resources to trace and refer to medical evaluation the sexual partners of patients with sexually transmitted infections (STI). Only a minority of such patients receives formal sex partner referral services. Hence this responsibility rests, by default, with the diagnosing clinician or with the infected patient. Unfortunately, clinicians do not sufficiently appreciate this public health lacuna, and patients with STI usually perform poorly at notifying partners. Clinician and patient obstacles to successful partner referral are discussed, and brief counselling techniques are suggested. Use of patient-delivered therapy, via medication or prescription (dispensed with appropriate warnings), probably serves to emphasize the urgency and importance of notifying partners. Successful referral to medical attention has been shown to help prevent re-infection of the index patient and to curtail community transmission.