Cheek kissing departing. It is uncommon between strangers of any sex, and it may be considered offensive otherwise. It is standard for children and parents, children and grandparents etc., and in its "formal" form it will be two kisses, one on each cheek. It may be a standard formal form of greeting in special events such as weddings. However, in Portugal and Spain, usually, women kiss both men and women, and men only kiss women (so, 2 men rarely kiss). In Portuguese families men rarely kiss men (except between brothers or father and son) , the handshake is the most common salutation
Cheek kissing considered appropriate among family members as well as friends and acquaintances: a man and a woman, two women, or two men. The last is less socially accepted in many cultures, In Eastern Europe, male–female and female–female cheek kissing is a standard greeting among friends, while male–male cheek kisses are less common. Eastern European communist leaders often greeted each other with a socialist fraternal kiss on public and state occasions. In a cheek kiss, both persons lean forward and either lightly touch cheek with cheek or lip with cheek. Generally the gesture is repeated with the other cheek, or more, alternating