Survival is a big theme. When an alien species arrives on Earth or when humans encounter aliens in a new environment, they often have to find ways to survive. This could involve sharing resources, learning from each other's survival skills, or just avoiding getting killed. It also includes the idea of adapting to the new or different, whether it's a new environment or a new species' way of life.
The theme of discovery is also prevalent. Humans are curious about aliens, and aliens might be curious about humans too. In stories like 'Contact', the main character is eager to make contact with extraterrestrial life and understand the universe better. Cultural exchange is another theme. Different species have different cultures, and when they meet, there can be interesting exchanges of ideas, values, and technologies.
One common theme is the idea of 'the other'. Since the alien is different from the human, there is often a sense of discovery and exploration. They have to learn about each other's cultures, if the alien has a distinct culture.
Another option could be tales of alien cultures and their unique family structures, such as 'Discovering alien family values'.
Another theme is the concept of adaptability. The human has to adapt to the alien environment, culture, and way of life. And sometimes the alien also has to adapt to the human's strange habits. It can lead to some really funny and heartwarming situations. For instance, in a story, the human likes to sing which the alien finds very strange but also endearing.
Another theme is sacrifice. Often, either the alien or the human has to sacrifice something for their relationship. It could be their place in their respective societies or their own safety. In some stories, the male human might have to protect the alien from his own kind who view the alien as a threat.
One common theme is friendship. Just like in the story of the girl and the kitten, where they were friends and shared love and care. Another theme is rescue. For example, when an animal rescues a human or vice versa. Also, there's the theme of companionship, like the old man and his dog who kept each other company.
One common theme could be the exploration of complex emotions. In a non - erotic ffm relationship story, the characters might struggle with jealousy, friendship, and the balance between different types of love. For example, two friends might both fall in love with the same woman, and they have to figure out how to handle their friendship while also respecting each other's feelings for her.
One common theme is cultural exchange. The alien girl brings her own planet's culture, values, and technology, while the male human represents Earth's. For example, in many stories, they teach each other about their different ways of life. Another theme is acceptance. The male human has to accept the alien girl's strange appearance or abilities, and vice versa. Love against all odds is also prevalent. Since they are from different species and often face opposition from both their own kind and society in general, their love is a struggle but also very powerful.
One common theme is identity. When a human and alien are combined in some way, the hybrid often struggles with who they are. Are they more human or more alien? Another theme is acceptance. Society in these novels, whether it's the human society or the alien one, has to deal with the existence of hybrids. Sometimes they are feared and other times they are revered.
Often, the theme of discovery is present. The human discovers the alien's world and vice versa. It can also be about love against all odds. Their relationship might be frowned upon by their own species, but they still fight for their love. And there's also the theme of learning and growth as they adapt to each other.
One common theme is the idea of 'the other'. The female alien represents something completely different from what the male human knows, so there's a lot of exploration of the unknown. For example, in many novels, the male human has to learn about the alien's culture, biology, and way of life.