In Western civilization, self-exposure is often a daunting process. I mean physical as well as psychological exposure. Self-exposure requires courage and trust, but fortunately it is rarely called-for.
In public, we cover ourselves up literally and metaphorically. We put our best foot forward, if sober. The only real exception is at the beach where everybody wears highly-exposing underwear and our flaws are out there for all the world to see.
My topic is shame, whether about our physical or our psychological beings. Most of the time, shame is not neurotic but a healthy human response to exposure of our flaws, imperfections, and general instinct for privacy. We all have all sorts of dirty laundry. We are all on some spectrum between shame-paralyzed and shameless. The extremes are problems.
What sorts of things are often on many peoples' shame/privacy lists?
Physical self must be exposed sometimes: physical exams, weight, strength, physique, dentist(!), beach, sexual encounters, excretory fuinctions
Psychological exposure: Our private thoughts, fears, fantasies, mental flaws and weaknesses. Sometimes we will cautiously expose these to close friends or to shrinks.
Other personal attributes: Money, personal habits and home, rotten behavior, political views, failures, public performances, job status, childrens' difficulties, etc.
Intimacy means showing aspects of our unadorned selves to somebody else. It is not something to be done lightly because our private selves are not necessarily appealing to others (note the expression "TMI").We know that better than anybody, hence shame.
Caveat: Sociopaths are quite good at faux intimacy for purposes of ingratiation and manipulation.