Atheism

Yeah, I can't disagree there's no explicit passage against human necrophilia, although my logic didn't preclude that. It is, however, made clear to a reasonable person given a combination of Leviticus' condemnation of "sexual immorality", the way it treats simple inadvertent touching of unclean things, and the way Numbers (immediately proceeding Leviticus) specifically in detail talks about human corpses as unclean:

Leviticus:

[5:3–6] When [someone] inadvertently touches the uncleanness of a human being, whatever his uncleanness that made him unclean may be, when he himself comes to know about it, he will be guilty. When a person has sworn inadvertently by what he has said, whether for evil or good, whatever it was that the person spoke, when he comes to understand what he said, he will incur guilt by one of these things. When a person is guilty of one of these things, then he is to confess whatever sin it was and bring compensation to the LORD for the guilt that he committed: a female from the flock whether a lamb or goat for a sin offering. Then the priest is to make atonement for him.

Numbers [the Lord speaking to Moses and Aaron]:

[19:11–16] "Whoever comes in contact with the body of a dead person is to remain unclean for seven days. He is to purify himself on the third day and he will be clean on the seventh day. But if he can't purify himself on the third day then he can't be clean on the seventh day. Anyone who comes in contact with a dead person (that is, with the corpse of a human being who has died), but who does not purify himself, defiles the LORD's tent. That person is to be eliminated from Israel, because the water of impurity wasn't sprinkled on him. He remains unclean and his uncleanness will remain with him. This is the procedure to follow when a man dies in his tent: Everyone who enters the tent and everyone in it is to remain unclean for seven days. Every open vessel that has no covering fastened around it is to be considered unclean. Whoever is out in an open field and touches the body of someone who was killed by a sword, or a dead body, or someone's bones, or a grave, he is to be considered unclean for seven days. [insert cleaning ritual] [19:20] The person who is unclean but who doesn't purify himself is to be eliminated from contact with the assembly, since he has defiled the LORD's sanctuary and the water of impurity wasn't sprinkled on him. He is to be considered unclean as a continuing reminder to them.

Thus, there's technically no specific rule about fucking a human corpse, but Leviticus and Numbers so heavily emphasize cleanliness and so heavily condemn "sexual immorality" (including so much as having sex with a menstruating women, which results in both parties being "eliminated from contact with their people") that this is obviously prohibited. It's "I can't believe they closed my restaurant down; where was the rule about turning the raw chicken into a fleshlight? I had a plastic glove over it!" The lawyering would have to be around what the punishment would be, not if the Bible obviously considers it wrong.

Also, this is beside the point, but I found the rawest fucking quote while looking into this:

[Leviticus 20:6] “I’ll oppose and eliminate from contact with his people whoever consults mediums or familiar spirits, thereby committing spiritual prostitution with them.