Cannibalism itself is not explicitly illegal in many jurisdictions, but the actions surrounding it can lead to serious legal consequences. Even with consent, the act of cannibalism often involves other illegal activities, such as murder or desecration of a corpse, which are punishable by law.
In some places, the law may focus on the consent aspect, particularly in discussions about bodily autonomy and individual rights. However, the reality is that engaging in cannibalism typically cannot be divorced from these surrounding illegal acts. For instance, if one person consents to becoming a meal for another, the act of killing them for that purpose is almost universally illegal. Even in cases where consent exists, there are still ethical and moral considerations that complicate the matter.
In summary, while consent might change the conversation, cannibalism is generally not legally permissible due to the broader legal implications. Engaging in cannibalism with consent raises significant legal, ethical, and moral issues that cannot be overlooked.