Food look yummy when tummy empty. Food look bad when tummy full.
It’s not about the stimulation of the nerves but rather the higher cortical interpretations of said stimulation. Same way you dont get excited when your pants rub against your genitals vs a booty (or anything that you “interpret” as hot time)
Edit: to clarify; what happens is that the post nut brain says enough with sexy stimulus and temporarily inhibits the spinal neurons from depolarizing and sending more signals in which case you only start to feel the uncomfortable sensations from repeted pressure and friction. Also keeping the erection itself is painful as it causes a relative ischemia in the penis by not letting blood drain away.
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