If you don’t usually connect milk with sensuality, that’s understandable. Just know that one container can provide 20% of your daily value of B12 and up to 17 grams of protein. It’s also a good source of potassium, which keeps your heart healthy and aids circulation — two essential factors in getting hard. And those are only a few of the factors that make it one of our favorite foods. Milk and cheese contain zinc, which is good for the male sex hormone testosterone, which in turn is required for an erection.