If you want to know where love is, you can find out by following the path from your nose to the brain via the epigenetic effects of food odors and pheromones on hormone-secreting nerve cells, not one that somehow links pictures to love and sexual desire. There’s no model for that!
The molecular biology of how nutrient chemicals calibrate the survival of individuals and how the metabolism of nutrients to pheromones that standardizes and controls species survival appears to link the nature and nurture of receptor-mediated behavioral development across species.
…the only sense that’s common to all species on this planet is the sense of smell…
Whether you like, love, dislike, or hate another person or particular food, your response is one that has been conditioned by odors.