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Areas that are sheltered from direct contact are generally sensitive.

The induction of laughter by tickling is a reflex, making it closely related to the startle reflex. It is believed to have evolved in humans over time as a protective reflex, as the areas in which we are ticklish are also the most vulnerable. This shows the ties between we and our other mammal cousins very closely; like nearly all mammal families who exhibit play-fighting in the wild, human parents (just like other primates, mind you) tickle their children in order to encourage the development of combat and defensive skills. The laughter that is associated with tickling is because positive reactions encourage the tickler to continue, whereas a negative reaction would discourage them and thus eventually lead to a more physically vulnerable animal.

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13y ago
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Q: Why do you feel ticklish in your armpit?
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