I came across a very interesting read today about some festivals Japanese and Korean celebrated.
Japanese has a White Day, also celebrated in Korea one month after VD, which women/men give white gift like marshmallows to whom he/she received VD gifts. It is getting quite popular in Hong Kong now.
Korea has Black Day one month after White Day, not consider as unlucky, where single people get together to eat noodle with black bean sauce to commiserate their singledom.
So, if you have a Korean or Japanese partner, you can return their favor next month.
Go to Wikipedia and find out more about this day.