Short-term pair-bond: a transient mating or associations Long-term pair-bond: bonded for a significant portion of the life cycle of that pair Lifelong pair-bond: mated for life Social pair-bond: attachments for territorial or social reasons, as in cuckold situations Clandestine pair-bond: quick extra-pair copulations Dynamic pair-bond: e.g. gibbon mating systems being analogous to "swingers"