St Valentine's Day

February 14 is St Valentine's Day.
In Japan, there is a custom of presenting chocolate to a male from a woman.
What does a woman of other countries do to a man on this day?

St Valentine's Day is not for only the woman who wants to confess love to a favorite man.
A woman distributes chocolate also to her brother or the coworker of an office by obligation.
It is called "obligation chocolate".
However, there is the man who is not pleased to get this "obligation chocolate".
In "white day" of March 14, the man should return three times expensive article than the chocolate gotten from the woman as the reward.
(I got a lingerie from the visitor of my part-time job place. )

it seems to suffer from nervous strain if the man should return the woman something even if half this manners are jokes.
Therefore, there is a man who thinks that it doesn't want "Obligation chocolate".