The frog-prince economy is the category's engine: every kiss is a gamble and everyone knows the odds. That shared mythology makes these lines weirdly safe to use — the worst outcome is a groan, and the best is someone who plays the princess or prince back at you.
They suit rainy-day texts, pond-adjacent walks and biology-flavoured flirtation. For the wider menagerie, the animal collection covers everything with more legs, and the cat and dog lines serve the domesticated end of the market.