However, it cannot be denied that, as social animals that cannot exist outside the social relationships, humans have desire to know it beforehand; as such, often there is a tendency in us which tries to know the compatibility with others in advance.
しかしこれを予め知りたいという欲求も、人間がその関係性のなかでしか存在できない（社会的動物）という面もあるために無理の無いところで、しばしばこういった相性を知ろうという考えも存在する。