Hedgehog’s dilemma

“The hedgehog’s dilemma, or sometimes the porcupine dilemma, is an analogy about the challenges of human intimacy. It describes a situation in which a group of hedgehogs all seek to become close to one another in order to share heat during cold weather. They must remain apart, however, as they cannot avoid hurting one another with their sharp quills. Though they all share the intention of a close reciprocal relationship, this may not occur for reasons they cannot avoid.”

Wikipedia

Exteroceptive/Interoceptive

Exteroceptive
Main Entry: ex·tero·cep·tive
Pronunciation: \ˌek-stə-rō-ˈsep-tiv\
Function: adjective
Etymology: exterior + -o- + -ceptive (as in receptive)
Date: 1906

: relating to, being, or activated by stimuli received by an organism from outside

Interoceptive
Main Entry: in·ter·o·cep·tive
Pronunciation: \ˌin-tə-rō-ˈsep-tiv\
Function: adjective
Etymology: interior + -o- + -ceptive (as in receptive)
Date: circa 1921

: of, relating to, or being stimuli arising within the body and especially in the viscera

Merriam-Webster Online Dictionary