《韩非子·八奸》
做臣子的通过内线用金玉财宝贿赂她们，让她们迷惑君主而答应臣子请托的事情，这就叫 同床 。
为人臣者内事之以金玉，使惑其主，此之谓 同床 。
The subjects bribe them with gold and jade through the inside line to let them confuse the monarch and promise the things the subjects ask for, which is called " Tongchuang ".