The reason there is a taboo about cannibalism is at least two fold; first, and most obvious, we don't like being considered food. So we abstain from eating our neighbor and he abstains from eating us. It's considered bad manners because it's not beneficial for the groups commitment to its members.
Secondly, it's about diseases. Other animals might have diseases, but we still eat them. In the case of many virii and bacteria, they cannot 'jump species', so we're safe. If we eat a human, there's no species jumping needed - and it's unsafer.
Plus there's much more meat on a pig. I mean, humans really aren't very meaty. Some are extremely fatty, but the overall muscle mass is relatively small compared to bowel size and bone structure. Plus, humans are dangerous little critters. They're sort of smart - and they're vicious like hell.
Unless the eating is more figuratively understood and performed by a man to a woman or alternatively by a woman to a woman.
That is a condoned practise in the Western world
