In his original thesis, Bowlby (1969) never formalized an extension of his attachment theory beyond childhood, but he clearly suggested that an extension should be sought. Perhaps his clearest statements regarding this expansion involved his suggestions that people change who they are primarily attached to as they age. He argued that among adolescents it was likely that peers played an increasingly important role in their attachment lives and that as adults people would primarily attach to a spouse or significant other. partner. Only in the last thirty years have researchers seriously attempted to extend the ideas of attachment theory to adult relationships. An influential attempt came from Hazan and Shaver's (1987) assertion that the attachment system is at least partially responsible for adult romantic bonding. Indeed, multiple parallels have been drawn between behavior in interactions between infants and caregivers and interactions between adult romantic partners. Zeifman and Hazan (1997) provide a fairly detailed account of the commonalities between adult romantic attachment and that of infant caregivers. They note that certain...