Participants will have two study sessions at the NIH Clinical Center outpatient clinic. They come to the clinic by taxi and, upon arrival, take a breathalyzer test for any measurable alcohol levels. They are then given breakfast, after which two catheters (plastic tubes) are placed, one in a vein in each arm. One tube is used to collect blood samples for measuring hormone levels; the other is for infusing alcohol. The infusion is adjusted so that the breath alcohol level is held constant for about 3 hours at a moderate level. Baseline measurements are taken before the infusion begins. During and after the infusion, the participants fill out questionnaires about their moods and feelings. Breath alcohol level and heart rate measurements are monitored frequently. After the test, participants remain in the clinic until their breath alcohol level drops below 0.02 g/L (generally 2 to 3 hours after the infusion stops). They are given lunch and then sent home in a taxi.