I didn’t mean to make a joke here, what was the funny part? Reading it again, maybe the tie:arm/leg sounded too much of a BDSM stuff?

Not my initial idea though: I was just looking at short words that might hold the analogy need, from "relationship" you easily come to "tie", and then "arm/leg" for "anterior/posterior" seems pretty straight forward and analogous to "antecedent/(consequent|postcedent|succedent)".