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.
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