Instead of simply offering more evolutionary theory, we detailed the link from the sensory environment to sexual orientation (e.g., the epigenetic effects of pheromones on the gonadotropin releasing hormone neuronal system).
the epigenetic effects of these modifications on sexual orientation and associated behaviors in a unicellular organism were known 16 years ago… why do they now appear to show up only in the behavior of the honeybee model organism?
The “rules” of the required molecular biology involve ligand-receptor binding. For example, from yeasts to mammals, genetic conservation of the ligand: gonadotropin releasing hormone (GnRH), and the diversification of its receptor (GnRHR) are part of the rules.
Visual input does not directly activate the hypothalamus. Olfactory input (i.e., food odors and social odors) directly activate the hypothalamus. Only via association with odors can what we see influence hormone driven behavior associated with activation of the hypothalamus.