We are not intimate with people we are not close to. Associates, or casual acquaintances aren't people that we are intimate with nor are they people that we should be intimate with. A close association, a close relationship is what is required before we can hope to build our intimacy with people. Building intimacy requires association, contact and familiarity. Knowing what the person will say, how they will respond, what they smell like, what they like or dislike, how they feel about you, etc.
Intimacy is marked by LONG friendship, or it's developed through LONG association.
This isn't your casual meeting. This isn't your surface chatter. This isn't the feel good agreement we so often engage in this isn't even a meeting of the minds, an agreement of the soul or an acknowledgment of our mouths. Intimacy is of a very personal or private nature. Private means intended for or restricted to the use of a particular person.