The history of zoophilia and bestiality begins in the prehistoric era, where depictions of humans and animals in a sexual context appear infrequently in European rock art. Bestiality remained a theme in mythology and folklore through the classical period and into the Middle Ages (e.g. the Greek myth of Leda and the Swan) and several ancient authors purported to document it as a regular, accepted practice—albeit usually in "other" cultures. Explicit legal prohibition of human sexual contact with animals is a legacy of the Abrahamic religions: the Hebrew Bible imposes the death penalty on both the person and animal involved in an act of bestiality. There are several examples known from medieval Europe of people and animals executed for committing bestiality. With the Age of Enlightenment, bestiality was subsumed with other sexual "crimes against nature" into civil sodomy laws, usually remaining a capital crime. Bestiality remains illegal in most countries. Arguments used to justify this include: it is against religion, it is a "crime against nature," and that non-human animals cannot give consent and that sex with animals is inherently abusive. In common with many paraphilias, the internet has provided a connective platform for the zoophile community, which has lobbied for the recognition of zoophilia (or zoosexuality as an alternative sexuality), and advocated for the legalisation of bestiality. Prehistory Depictions of human sexual activity with animals appear infrequently in prehistoric art. Possibly the oldest depiction, and the only known example from the Palaeolithic (prior to the domestication of animals), is found in the Vale do Côa in Portugal. It shows a man with an exaggerated, erect penis juxtaposed with a goat. However, there is some doubt that the two figures are contemporary; while the goat is depicted in characteristic palaeolithic style, the scene may have been altered in a later period with the insertion of the human figure. From the Neolithic onwards, images of zoophilia are slightly more common. Examples are found at Coren del Valento, a cave in Val Camonica, Italy, containing rock art dating from 10,000 BCE to as late as the Middle Ages, one depicting a man penetrating a horse, and Sagaholm, a Bronze Age cairn in Sweden where several petroglyphs have been found with similar scenes. Classical antiquity Several Greek myths include the God Zeus seducing or abducting favoured mortals while in the form of an animal: Europa and the bull, Ganymede and the eagle, and