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Published 17:06 17 Jan 2016 GMT

The lighter the colour, the cooler it is to touch the person there, and a zone coloured in black would be considered an inappropriate contact point.
Unsurprisingly, the crotch area is consistently black, apart from your partner's of course, and the safest place to touch someone is usually the shoulder and arm area.
Respondents generally don't want to be touched at all by strangers, except for a handshake, so maybe reconsider the chest bump.Explore more on these topics: