Man greeting Man - Men shake hands when greeting one another while maintaining direct eye contact.  A firm but fairly brief handshake is the norm. With friends, a simple hello will suffice.  

Woman greeting Woman- At a first meeting, women generally shake hands while maintaining direct eye contact. Between good friends and family kissing on one or both cheeks is common.

Man greeting Woman- At a first meeting a regular handshake will do. Good friends and family may engage in a light hug or a kiss on one or both cheeks.

Note: When dealing with groups of people, it’s best to take the time to shake hands with everyone individually when arriving and departing.