Lux's behavior

A place in the reading that caught my eye was on page 84, when Dr. Hornicker says that "Lux's promiscuity was a commonplace reaction to emotional need"(84). While the doctor has been portrayed as truly terrible in his practice, how much of his statement is true? On page 82 Trip says that sitting in the Lisbon living room was like "a dead planet"(81). My final question brought on by this quote is that if the doctor is right, how much of this type of behavior are the other girls going to show?