  The alleged link between unnaturalness and wrongness can be supported in two ways, depending on whether the Unnaturalness Argument is intended to be a so-called intrinsic objection or an extrinsic objection. An intrinsic objection alleges that an act is wrong because of its intrinsic properties, whereas an extrinsic objection alleges that an act is wrong because of its consequences. A person who claims that it is unethical to feed a certain diet to an animal because the diet is unnatural is presumably making an extrinsic objection: because the diet is unnatural, it will not meet the nutritional requirements of the animal and therefore it will have unacceptable consequences for the animal’s health. A person who claims that the unnaturalness of bestiality makes it unethical, even when it does not cause any harm or pain, is presumably making an intrinsic objection.