Animal sexual behaviour however, is proving to be false as, "most hormones don’t influence behaviour directly. Rather, they affect thinking and emotions in variable ways (Azar, 40)." There is much more involved in sexual behaviour in the mammalian animal than oxytocin and vasopressin can explain. It is often assumed that animals do not have sex for pleasure, or alternatively that humans, pigs, bonoboes (and perhaps dolphins and one or two more species of primates) are the only species that do. This is sometimes stated as "animals mate only for reproduction". This view is considered a misconception by some scholars. Jonathan Balcombe argues that
Personality in animals often measure personality by assessing the behavior of the being over a period of time to establish the pattern. Naturally, some animals may not have as wide a range of personality as humans do. The species of the animal determines how the personality manifests itself. Likewise, a species may be predisposed to exhibit a category of personality more than other categories. So far, chimpanzees are the only animal shown to exhibit conscientiousness. Chimpanzees are also the only non-human species shown to demonstrate a hierarchical structure of personality, with two dimensions of affect corresponding to negative and positive emotionality, and a