Which ingredient is used to fill a Sex on the Beach cocktail?

In a Sex on the Beach cocktail, the primary filling ingredient is cranberry juice. This drink combines vodka, peach schnapps, and cranberry juice, along with orange juice. While orange juice is indeed one of the ingredients, it is not the primary juice used to fill the cocktail. Cranberry juice adds a tart and slightly sweet flavor that complements the other ingredients, making it essential for achieving the signature taste of the drink.

Orange juice provides additional sweetness and acidity, but cranberry juice is key as it defines the cocktail and gives it its distinctive color. Thus, cranberry juice is the most appropriate answer for the filling ingredient in the Sex on the Beach cocktail. Understanding the role of each ingredient helps in crafting the drink correctly, making it important to know how they contribute to the overall flavor profile.