WHEN greeting your friends, how many kisses do you plant on their cheeks?
It's a puzzle shared by the socially shy and the outgoing.
Whether to do the one-cheek brush, or to go for several kisses and appear over-enthusiastic ?
Obviously, this is a problem the British Prime Minister Gordon Brown shares.
Photographers caught an awkward moment when he greeted German Chancellor Angela Merkel at a meeting of European leaders in Berlin last week.
Brown was no doubt aiming for a casual kiss on Merkel's cheek, but the kiss instead appeared to fall on the German leader's nose.
So, what is the proper way to kiss others in greeting?
In Britain people usually kiss each other once on the cheek.
There are no rules about which cheek to kiss.
In the past English gentlemen used to kiss a woman's hand in greeting, but between males a masculine handshake was considered good manners.
The handshake has survived time, but kissing the hand has not.
Some formal British greetings, however, have survived.
When a person is given the honor of meeting the Queen, a man is supposed to bow to her while women are supposed to curtsy.
In France, the rules are different.
People kiss both friends of the same age as well as their family members.
Most French give two kisses – one on each cheek.
The Netherlands has the most complicated rules.
The Dutch kiss begins and ends on the same cheek.
Three kisses are expected, but when greeting an elderly or close family member, there'll usually be a few more.
Just remember, the right cheek always comes first.
Kissing in Italy is only used to greet very close friends or family.
The number of kisses is optional, and as there are no rules on which cheek to kiss first, there are often clashes.