Avocado is the Aztec word for testicle, but the benefits of this fruit (technically a berry) go beyond your sex life. An avocado contains 26g of fat — the monounsaturated kind, that is, which helps lower LDL cholesterol levels and improves blood flow throughout your body, including below the belt. It also has vitamin E, good for hair and skin. "Avocados are a nutritious substitute for mayo on sandwiches, and they add creaminess to smoothies," says Nicole Silber, R.D., nutritionist at Middleberg Nutrition in New York City. They make up for their high calorie count (320 each) by being so filling. We recommend sticking to a half avocado at a time for the best balance of health benefits without too many calories.