Marketers basically decide what is 'girl' and what is 'boy,' which ultimately leads to two very distinct ways to profit as well as a blind acceptance from the consumer who, often, doesn't realize it's happening, girls are inundated from a very young age with inappropriate messaging by way of products like 'skinny' jeans for toddlers, or T-shirts that say, 'I'm too pretty to do homework, so my brother does it for me,' and sexy Halloween costumes. Kids begin to codify other kids by placing them in strict categories that they've been taught -- not born with. Inevitably, kids begin to believe that girls need to be sexy, and boys believe it, too.