Subjects will be confined to the study unit for blood sample collections for determination of NGMN, NG, and EE serum concentrations. Blood samples will be collected (via venipuncture) immediately before and at specified time points after each patch application. Pharmacokinetic parameters of NGMN, NG, and EE, including Cmax, tmax, and AUC for each treatment will be estimated by standard methods. Safety will be assessed throughout the study, and will be based on adverse events and changes in physical and gynecologic examinations (including breast examinations), vital signs, electrocardiograms (ECGs), and clinical laboratory test results. Three 7-day treatment periods, separated by 21-day washouts, as follows: Each ORTHO EVRA® patch will be worn on the buttock (upper outer quadrant) for 7 days. Twenty one days after completing each treatment, subjects will cross over to the next treatment for 7 days. The patch will be applied to the upper outer quadrant of the same buttock as before, but not necessarily in the exact same spot.