There were once three people who lived in three houses next door to each other, and their digestive systems worked differently. Marie who lived in the house in the middle which was painted red, had a hole in her head that secreted saliva, and contained a muscle for mashing food and a bunch of small hard bones for slicing it and crushing it. The saliva had an enzyme called amylase which broke down the starch in the food into sugar, and she had a muscular tube which sent food from this hole into the recesses of her viscera for further digestion. She also used this hole to talk.
To the left of Marie lived Oswald in a house that was painted green. Oswald also had a hole with hard stones in it for crushing food and he also had digestive juices with amylase for turning starch to sugar, but these were both in a muscular sac in his body. The hole in his face that he used to ingest food was clean and relatively dry, and he talked by flashing lights from a light emitting organ in his head.
To the right of Marie, in the yellow house with chocolate trimming, was Kathy. Kathy’s face had a big open sac full of hydrochloric acid. She talked with this and kissed with it too. It dissolved food into chyme and then a muscular tube took it to her intestines to extract nutrients.
When Marie fell in love with Kathy and they first shared a dinner, Marie threw up! She thought it was disgusting because Kathy tried to kiss her with a sour organ and then spewed acid all over her food. And then when Marie threw up — since Kathy formed chyme with her mouth — well. Let’s just say it was a bad scene.
But then Marie tried romance with Oswald and — guess what? When he saw that she wanted to kiss him with a face hole that for him was hidden in his body, a face hole that had amylase in it, and bones for crushing food, he heaved!
He didn’t actually throw up because he couldn’t do that.
The point is they were all lovely people and they shouldn’t have gotten hung up about these relatively minor details that don’t actually matter, and gotten beyond it and focussed on something more important.
Which they eventually did!