The expected duration of this study for each participant is 16 weeks. Study participants will be randomly assigned to one of two arms. Participants in Group A will insert an IVR into their vagina at study entry. The IVR will remain in place for 12 weeks until removed by a physician. Follow up will continue for an additional 4 weeks after IVR removal. Participants in Group B will not receive an IVR, but will follow the same study schedule as those in Group A.