I'm going to take this shit post seriously for some reason. Sometimes people confuse morality with practicality. Or associate groas factor with immorality, or even things associated with something gross with immorality. Yet, they are all related for a reason.

We have an inherent revulsion to fucking dead bodies. This is because dead things spread diseases, and therefore we instinctually avoid it. Also culturally it is disrespectful and gross. Practically, it is best to decide as a society to not allow that, and shun people who do it. If you practice safe sex with the corpse, and nobody legitimately knows or is hurt by this action, is it morally acceptable? Maybe, but what are truly the chances of a freak who would fuck a corpse wearing a condom because he's concerned for future sexual partners? If he is a necrophiliac, what are the chances that this wouldn't extend to killing to achieve this, or stealing bodies, which would be traumatic for the people related to the people whose bodies he acquired? If he is wired differently and doesn't get this ick factor from fucking dead things the way regular humans do, either his brain is a little messed up, he has gone through some traumatic, personality changing experiences, or he has specifically sought our to desensitize himself from shame. Do you want to trust such a person in society? Or should we perhaps correct deviant behaviors before they become a problem? There's a lot more context than a specific example in a vacuum.

Incidentally, this is what some people don't get about pedophilia/related philias. An ex girlfriend of mine once had a discussion with me that people were obsessed with condemning age gaps online. While true, I didn't agree with her because she went on to say "when I was a teenager, I remember going to a concert for my favorite band and wishing I could fuck the lead singer. If that had happened, I would have been happy and still talk about it today, not yap about how it was abuse." And yeah, maybe, in that instance, it would have been fine. Or maybe he would have pulled a Steve Tyler and became her legal guardian so he could fuck her all the time and been abusive and controlling, and derailed her future by taking her out of school and on tour with him and getting her pregnant then leaving. Is it POSSIBLE to have someone underage consent? Maybe (and a big maybe at that) but really what are the chances that it is a completely healthy and fulfilling relationship that will be positive for both people in the long run? Stigmatizing inappropriate age gap relationships only benefits society. 18 is an arbitrary line, to be sure. Is 17 or 16 OK? Multiple developed countries think so. 15? Not so sure, maybe focus on the actual size of the age gap there, which most countries do. But at some point we have to draw the line as a society to just say "no, sexual activity with this child is not allowed" to not allow for abuse of trust, because kids don't know what is best for them and what they want yet. And is it then morally wrong to violate what society has decided the arbitrary line is? Yes, at least in most cases. Legal does not mean moral, but to completely disregard society is not a way humans are meant to live. So are you going to be a normal guy that can take the "hit" of not dating under 18, or are you going to be the creep flirting with high schoolers and yapping about Romeo and Juliet laws?

This nuance is hard for people to understand. Even in organized religion, where God presumably has all the "right" answers, there is not always an absolute answer. In Christianity for example, Paul writes in 1 Corinthians 10 to avoid practices that make others uncomfortable or more likely to hurt their conscience, even if God doesn't specifically condemn said practice, and to avoid flexing your "rights" on others if it bothers them. "All things are lawful but not all things are helpful." Mysteriously, this part of the bible tends to not be remembered, and religious people instead veer towards absolutism.