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 is a short, perfunctory greeting, and is most often done by relatives. Giving someone a kiss on the cheek is also a common occurrence between loving couples. Cheek kissing between adults, when it occurs at all, is most often done between two people who know each other well, such as between relatives or close friends. In this case, a short hug (generally only upper-body contact) or handshake may accompany the kiss. Likewise, hugs are common but not required. A hug alone may also suffice in both of these situations, and is much more common. Particularly in the southeastern United States