I think that we are struggling with definitions and moments. What the retina registers, what gets processed in that layer of receptors/processors getting funneled into the optic nerve, and what becomes manifest in the brain; that is visual perception. This doesn't just shine onto a screen in our brains but streams through as many as 30 pathways that treat the info in different ways and effect the consequent final experience of perception. The reaction to it is exceedingly primitive. The simplest analogy is reacting to something touched that burns you; it is considered as a reflex.
I think the best way to relate my idea of hard-wiring is with the concept of human imprinting. An infant has no inculturation yet it responds to temperature, sounds and such. The infant knows to suckle when presented with a nipple in the first moments of life. By the time the neo-natal starts to see, a murky experience at best, it starts to perceive shapes, notably and hopefully mother, to which the infant attends and "values". Along with the other stimuli a bond, which roots are in the infant brain, is created; it is a survival behavior. The relationship with mother is something built upon that. It is not a decision as we understand them. It is not a reflex. It is an early identification based upon need to survive built into us. It fits within our primal need.
Our reaction to images, especially if they are well executed, blows right by all of our defenses. It is in us before we know it and touches a part of us at a very primitive way. We have an emotional reaction to that and it can be bewildering. Are we reacting to our "nature" or powerful events or often re-experienced events. How we manage that as children, as adolescents, and adults is quite different.
As to nudes, sexual identity, and the like: the early days of life and life experience seem to be the greatest determinants, built immediately upon an early identification, based upon need to survive built into us.
This part is less sciency: my creative vision was smothered by a need to make money, which I did for many years. It is only through my move to shooting people that I could get back to something more meaningful at a deep level. As I have involved myself in instruction my camera, my apprehension, has been moved to capture things I do not understand. I've learned not to ask questions, not get bogged down in culture or have my brain/ego get in the way. As quickly as possible, I get a good exposure, develop the images to my best abilities, and experience the result. I believe it is a primitive experience of perception.