A randomised controlled experiment was conducted in Soweto, South Africa, to assess the impact of several interventions on the uptake of voluntary medical male circumcision (VMMC). The study compared receiving a cash transfer conditional on completing a counselling session about VMMC versus no incentive and receiving a postcard with a challenge (“Are you tough enough?”) versus no postcard. The findings are presented in this article, published in a supplement to the Journal of Acquired Immune Deficiency Syndromes about interventions to create demand for VMMC.