I agree with ezpz - it is also largely cultural. There are often taboo spots on the body to actually touch depending on the relationship with the other person. But in many societies it is completely normal to sit down very close to a complete stranger, be very close and maybe even touching when talking to a stranger, hold hands with members of the same sex in a non-sexual way, etc. I don't doubt that Americans get upset when their personal bubble is violated - we are all encultured bodies and we learn to experience space through that. But I wonder what results they'd get if they did this study in India.
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