Many of us have problems with attracting people of the opposite sex and rejections, but can you even imagine wanting a partner that would never reject you-because they are dead. Most people that have necrophilia are seeking a non rejecting partner, you can’t get more non rejecting than a dead person that can’t do a thing. These people are suffering with deep psychological problems to even be thinking that this is the answer.
Mentions of this have been around since the days of ancient Egypt, when particularly beautiful young women that died were left to decompose for a few days to become less appealing to embalmers. In many states it’s not even a felony, just a misdemeanor. I guess they figure it’s a victimless crime. Distasteful yes, but they are already dead, they aren’t hurting them, but how terrible to do such a thing and defile a dead person in such a manner when they can’t defend themselves.
Of all the fetishes people could be involved with, it’s hard to imagine a future partner overlooking this and being ok with having sex with someone that had had sex with a dead person. Some have had sex with a dead partner since the sense of attachment was so strong, they just couldn’t let go of them. The body is just a shell though, not what made them who they were, but I guess if someone is so far off the rails they are considering having sex with a dead body, there’s no reasoning with them.