Why do clients not know how to kiss?

They're all awful.

Shoving their tongues to the back of my throat and tickling my tonsils. Holding their mouth as open as it goes. Licking my face? Actual animal behaviour. Straight up chewing on my lips. One guy coughed into my mouth mid kiss. Awful. Another latched onto my nose and tongues my nostrils.

How can anyone think this stuff is good? It's easily the worst part of the job, I'm thinking about refusing to kiss any of them from now on, or at least charging extra.