Food odors and social odors
Fragrance use adds to the appeal of men’s axillary odors.
brain development
Timing is key in the proper wiring of the brain: study
This effect helps to explain why the odor preferences of mammals, including humans, appear to develop before birth, but it probably has nothing to do with visual input except via its association with olfactory/pheromonal input, neurogenesis, learning and memory.