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
Sex effects of water pollution humans because of constant exposure. The pollutants found in the water have been observed in many studies that produce concrete data describing the effects they have on the hormones in both males and females. Studies have been conducted on animals, but the observed trends are also associated with effects noticed in humans. Scientists observing EDCs in women’s blood found that these chemicals mimic human hormones and trigger changes in the sex-determining process of unborn children. Some scientists suggest that this hormonal influence on the sex-determining process has led to a decrease in the male/female ratio. Other effects directly influencing the