Some see animated expressions as a sign of a lack of control. Too much smiling is viewed in as a sign of shallowness. Women smile more than men. But within USA, African-Americans use more eye contact when talking and less when listening with reverse true for Anglo Americans. A prolonged gaze is often seen as a sign of sexual interest.
Arabic cultures make prolonged eye-contact.
Japan, Africa, Latin American, Caribbean avoid eye contact to show respect. An African-American male goes into a convenience store recently taken over by new Korean immigrants. He is upset when his change is put down on the counter in front of him. But each culture has a clear concept of what parts of the body one may not touch. To do so is a social insult.