Given that Leviticus 18 is a list of banned sexual behaviours, you can argue that bestiality, incest and child sacrifice are OK because they are also in the list in Lev. 18. And those things are the things for which God is punishing the existing gentiles of the land for - so it really isn't anything specific to the Jews / Kosher in this verse in this context.

20 " 'Do not have sexual relations with your neighbor's wife and defile yourself with her.

21 " 'Do not give any of your children to be sacrificed [a] to Molech, for you must not profane the name of your God. I am the LORD.

22 " 'Do not lie with a man as one lies with a woman; that is detestable.

23 " 'Do not have sexual relations with an animal and defile yourself with it. A woman must not present herself to an animal to have sexual relations with it; that is a perversion.

24 " 'Do not defile yourselves in any of these ways, because this is how the nations that I am going to drive out before you became defiled. 25 Even the land was defiled; so I punished it for its sin, and the land vomited out its inhabitants. 26 But you must keep my decrees and my laws. The native-born and the aliens living among you must not do any of these detestable things, 27 for all these things were done by the people who lived in the land before you, and the land became defiled. 28 And if you defile the land, it will vomit you out as it vomited out the nations that were before you.



• ( http link ) Leviticus 18
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