I assume it's because chocolate does not talk back; and, chocolate smells better than most of us guys. Chocolate patiently waits until the woman is ready. (Although chocolate does go bad if one waits too long.) Chocolate always looks good in the wrapper and out of the wrapper. Chocolate is never self conscious about hair loss. Chocolate only receives love; but, never demands it.
How'd I do? I consider myself fairly clueless about women.