Man greeting Man - Men shake hands when greeting one another and maintain direct eye contact.  At a first meeting a handshake will suffice and is sometimes combined with slight touches on the arms and/or elbows

Woman greeting Woman- At a first meeting, women shake hands or give  a light touch on the forearm.  Friends and close acquaintances generally kiss each other once on the cheek. 

Man greeting Woman-   At a first meeting a regular handshake will do.  Friends, family and close acquaintances may share a light kiss on the cheek.