Zoophilia of bestiality is partly caused by irrational speciesism and anthropocentrism. Because interspecies sex occurs in nature, and because humans "are" animals, supporters argue that zoosexual activity is not "unnatural" and is not intrinsically wrong. Research has proven that non-human animals can and do have sex for non-reproductive purposes (and for pleasure). In 2006, a Danish Animal Ethics Council report concluded that ethically performed zoosexual activity is capable of providing a positive experience for all participants, and that some non-human animals are sexually attracted to humans (for example, dolphins). Some zoophiles claim that they are not abusive towards animals: "In other
Sex at Dawn "Sex at Dawn", Ellsworth suggests that the book's positive reception in popular media will project "a distorted portrayal of current theory and evidence on evolved human sexuality" to the general public. Ellsworth and colleagues also note that contrary to what is argued in "Sex at Dawn", "the existence of partible paternity in some societies does not prove that humans are naturally promiscuous any more so than the existence of monogamy in some societies proves that humans are naturally monogamous". Ryan argues that although Ellsworth makes some valid points, he misunderstood his and Jethá's central argument. According to Ryan, they did