In Japan, Valentine's Day is the day of chocolate.

February 14 is Valentine's Day. This day can be said as the day of chocolate in Japan.

Women give chocolates to men on this day. 
Originally, Japanese women donated the chocolate to love men. 
Now they can give the chocolate to various people.
However, for still women, Valentine's Day is an important date on which they can give a chocolate to love men and convey the affection.
And, men who received the chocolate is courtesy that give sweets to the woman on March 14. 
How about in your country?