Buss and Greiling cite individual differences in attachment as a principal
illustration of adaptive individual differences. This particular example, h
owever, is a highly controversial one: Many if not most relationship resear
chers assume (implicitly or explicitly) that insecure attachment patterns r
eflect some kind of malfunction of the attachment system in modern environm
ents rather than evolved facultative strategies. I therefore review some of
the arguments and evidence on both sides of this issue, along with the clo
sely related topics of mating/reproductive strategies and parental investme
nt. In the end I support the Buss-Greiling position, but for reasons not di
scussed in their article.