Sex is a need and chocolate is a sweet.
Sex is required for the human race to expand and for the survival of our existence. Human race will not grow if opposite sexes do not get physically intimate. Nowadays even though there are other options to create babies in a woman's womb, still the act of sex remains the primary technique. Moreover, the need and want to satisfy the sexual urge of both the sexes has far more increased than in previous times.
Chocolate is a sweet delicacy made out of cocoa seeds and is consumed by many daily to satisfy their need of taste. Some of us are addicted to chocolate and eat it everyday. It is given as gifts to children or even during festivals.
Chocolate is abundant in supply and can be bought easily. Sex on the other hand can only be performed with mutual agreement from both the parties involved.
Sex is more important than chocolate, cause the existence of the human race depends on this act, and not chocolate. If humans do not exist, chocolate will not be consumed or required.