It is sexual pleasure that one gives themself. Usually it leaves men with “post nut clarity” and they feel very sad and lost. Women usually feel great after and continue with their day.
That's the answer right there
The answer should be the "small intestine." 90% of digestion takes place in the small intestine and that's because that's during the process of digestion the small intestine sucks all of the nutrients out of the food then passes off the waste. Digestion starts as soon as you put food in your mouth because your saliva contains chemicals that breaks the food down.
Hope this helps!
Rapid breathing, a weak pulse, sweating, pale skin, and loss of consciousness are all signs of shock.