[Solved] The research by Paul Ekman and W.V.Friesan show that the modes of human emotional expression: A)vary across cultures B)change as we grow older C)are the same among all human beings D)are very similar to other mammals E)have changed significantly in the last 50 years Oral Sex: Sexual activity involving the stimulation of the genitalia of a partner using the mouth. Committed Relationship: A long-term partnership between individuals where there is mutual affection, trust, and support. Opportunity Arises: The emergence of a situation or condition that makes it possible to do something or for something to happen. Erotic Plasticity: Definition: The degree to which one's sex drive can be changed by sociocultural and situational factors.