Maturana used to use the phrase 'biological stickiness' to describe how any two systems, upon encountering one another, stayed or 'stuck' together. They fit together and remain together and continuously interact recurrently with each other. More recently he has used the more dangerous word 'love' to describe this happening of living. Love is a phenomenon which takes place a priori, without precedent, and without prior justification.[...] In other words love is an expression of a particular structural configuration in the two participants such that they stick together with no reason. Love is a primary constitutive condition and is fundamental if social phenomena are to arise.