You can think of carnal as a line drawn through a person. On one side is the flesh: the body, what it wants, what it can touch and own. On the other side is the spirit: the mind, the soul, things that are supposed to last. Carnal always names the first side, and it is nearly always used by someone who is looking at the second side while they say it.
From the word’s history
Wiktionary traces carnal to Latin caro, carnis (meat, flesh) through Late Latin carnalis (fleshy) and Old French charnel. The flesh is not a metaphor added later; it is what the word has always named.
Wiktionary 記錄 carnal 來自拉丁文 carō、carnis（肉），經過晚期拉丁文 carnālis（肉的）和古法文 charnel 才進入英文。也就是說，「肉」不是後來加上去的比喻，而是這個字從一開始就指著的東西。理解了這一點，兩個用法都不用另外記。
Wiktionary entry 'carnal' (kaikki:3f6f69a190036ae4:752913030), etymology_text: 'From Middle English carnal, from Old French charnel, from Late Latin carnālis (fleshy), from Latin carō, carnis (meat, flesh) + -ālis.'
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