Pavlovian Response.
If you haven’t heard of it, the Pavlov experiment involved ringing a bell every time a dog was fed, followed by just ringing the bell without feeding the dog. The dog would still respond the same way (salivation) just from the sound of the bell, even though no food was present.
For most of mankind, seeing naked bodies was typically accompanied with sex which of course includes the arousal of sec organs. Take the sex away but still present the visual stimulation, you still get the arousal.
Now, the bell experiment was small scale and that’s why *all* dogs don’t drool when they hear bells.
Humans, on the other hand, have their entire existence worth of conditioning to develop the automatic response to visual sexual stimulation, so much so that it’s inherited through genetics.
The largest sex organ in the human body is the brain.
Might as well ask how memory works. I’d tell you, but I forgot.
A certain pattern of stimulae, images, sounds, sensations, smells, or god forbid tastes, trigger a reaction that’s been built up through decades of conditioning and eons of evolution. The net result is the “Oh goody, I’m gonna get laid now!” reaction.
Adding to other responses here, this may all seem kind of strange because sexual attraction is largely an unconscious process. We really don’t fully understand why we are attracted to someone and there is evidence that we still function using the more primitive means of mate selection, like our ancient ancestors. There are also major gender differences such that males are much more visual creatures when it comes to sexual arousal. Humans also use classical conditioning in many cases to become aroused by atypical things. Check out choice blindness when you get some free time.
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