Joke Collection Website - Talk about mood - Why use "licking" as a metaphor to please others?

Why use "licking" as a metaphor to please others?

It should be "sucking carbuncle and licking hemorrhoids"

[Explanation] Suck: Gather your lips and suck; Carbuncle: toxic sore; Lick: Lick is only for people to lick and suck the pus blood of sores and hemorrhoids. Metaphor is intended to flatter people.

Source [Source] "Zhuangzi Lieyukou": "Qin Wang is sick and calls a doctor, and the broken one gets a ride; People who lick hemorrhoids ride fifty-fifty Under the rule, the more cars. "