I'm able to look at people whom I love and care deeply about, such as my parents, my brother and my close friends. Sometimes I even stare at them, because it feels like my love for them enhances their beauty. I could stare at them for hours if it didn't make them feel uncomfortable.
On the other hand, I can't look at people whom I hate, such as my uncle and my sister. I always either look down or in some other direction; any direction but theirs. Many times I can't even stand to be in the same room as they are, so when they walk into the room, I get up and leave. They get hurt and wonder why I am like this, but if I told them the truth, they wouldn't be able to handle it. I am not like this just to be cruel - I have my reasons for behaving this way.
When it comes to eye contact, those are the two extremes. The majority of people fall somewhere in between.