Cholesterol gets a bad rap, but we can't live without a certain level of cholesterol because it aids in our bodies' development. Cholesterol played a part in your sex life long before you had one, most likely. That's because it's integral to the development of sex hormones. In women, cholesterol aids in the production of estrogen and progesterone, and in men, it spurs creation of testosterone. Without these hormones, we'd never cultivate certain physical traits associated with gender, like breasts for females or increased body hair for males. These hormones are also essential for reproduction, so if you're using sex for procreation, you owe a good deal to cholesterol.