My personal experience, essentially is that we smell like pork, our bodies, our flesh. So a taboo makes innate sense.

I had surgery, and I was allowed to handle the part of my body that was resected. It was a bone and there was still some of my muscle.

I smelled like the best piece of pork. Like if you had a piece of pork from a pig, which that pig clearly was loved so caringly before it was slaughtered: it was worshipped, and massaged, and fed all the best food. That's what my growth suggested, odoriuosly.

(Cue the Mike Meyers joke about loving the smell of your own farts, from The Goldmember movie series..?)

My conclusion is, humans smell like pork so it's just kind of yucky to lust after the taste of another person.

There are still people who are cannibals, tribes. At least back in the '80s I understand there were active tribes in North Asia, according to a college professor's (of mine) direct experience.