One interesting story could be about a big pink pig that escaped from the farm and went on an adventure in the nearby forest. It met various other animals like friendly squirrels and curious deer.
I'm not aware of any specific works that would be centered around 'animal on animal sex stories' in a non - scientific context. This kind of topic is not something that is typically explored in general reading materials. We usually focus more on positive aspects of animal relationships like cooperation, parenting in animals, etc.
There are indeed ethical concerns. When we start to focus on 'animal on animal sex stories' in an improper way, it can be a form of voyeurism towards animals. Animals' behaviors are part of their natural instincts and should be studied in the context of their habitats and evolution, not for salacious or inappropriate storytelling. This also goes against the principles of animal welfare as it can create a wrong perception of animals as objects for our entertainment rather than living beings with their own rights and needs.
One interesting true animal sex story is about the praying mantis. After mating, the female sometimes eats the male. This may seem cruel but it's actually a survival strategy. The female needs extra nutrients to produce her eggs, and the male's body provides those.
Among seahorses, it's the male that gets pregnant. This is a very unique situation in the animal world related to reproduction (which is related to sex). The female deposits her eggs into the male's pouch, and he incubates them until they are ready to be born.
Well, the big pink pig is obviously a main character. There could also be the farmer who takes care of the pig. Maybe there are other farm animals like cows and chickens that interact with the pig in the story.
Among wolves, there is a complex social structure related to mating. Usually, the alpha male and alpha female are the main breeding pair in a wolf pack. They ensure the survival and growth of the pack through their reproduction. Also, in many species of insects, such as butterflies, the male uses its sense of smell to find a suitable female for mating. The male may detect pheromones released by the female from a distance and then approach for mating.
One interesting story is about peacocks. The male peacock displays its magnificent tail feathers to attract the female. This is related to their mating behavior as the female chooses the male with the most impressive display. It's a way of ensuring the survival of the fittest genes in their species.
It is inappropriate and goes against moral and ethical norms. We should respect animals and their natural behaviors without objectifying them in such vulgar ways.
Well, in 'Pulp Fiction', it might be that the idea of a pig being a filthy animal is part of the overall gritty and somewhat unseemly world that the movie portrays. Pigs are often associated with messiness and gluttony in general cultural perception. The movie might be using this common perception to enhance the atmosphere of the story, to show the base or unrefined aspects of the characters or the situations they are in.