Because it is sweet, delicious and healthy. Although there is no statistics used as an indicator applicable for all people, I agree that there is a tendency for girls to love chocolates more than boys.
I think women are more passionate than men! This leads to a difference in the rate of secretion of the hormones of sadness and happiness, including serotonin and melatonin (for happiness) and progesterone adrenaline (for sadness) so when feeling sad women tend to eat sweets to reduce the hormone grief and thus raise the proportion of happiness hormone
I think everyone loves chocolate. It not the matter of any specific gender. But scientifically we can say that the female's cyclic rise and fall of hormones such as estrogen and progesterone trigger a craving for chocolate.
The cultural environment plays a big role in determining, or imposing, what one desires, or reinforcing desires that already exist but in small proportions. And commercials often use women to promote chocolate.
The main reason behind women and girls taking chocolate more than men or boys , is to keep concentration and belittling of the depression and fulfill their duties in correct way.
Chocolate helps the body generate serotonin, which is the happiness hormone that regulates the mood, reduces mood swings and that even prevents depression!!
Women love chocolate so much because it helps them regulate their mood as a result of the hormonal changes they experience
Female experience significant hormonal changes quicker and more frequently as compared to men and mature early too. Chocolates contain chemicals that help body generate serotonin ( happy hormone ) which helps female to combat stresses and anxieties they have to go through in their early ages. So, women prefer to have chocolates more because of these biological reasons.