English ditransitive constructions have received their fair share of attention in linguistic literature. However, a curious omission in the otherwise exhaustive coverage of the phenomenon has been the apparent asymmetry in passivizability between dative ditransitives (constructions that correspond to to-datives) and benefactive ditransitives (constructions that correspond to for-datives). In other words, while dative ditransitives seem to passivize freely, benefactive ditransitives are much more constrained in their capacity to passivize. The present investigation attempts to provide a cogent explanation for this asymmetry by building on the widely-acknowledged assumption that passivizability is a function of transitivity. Specifically, the study adopts Rices (1987) notion of transitive prototype” and argues that the passivizability of benefactive ditransitives is governed by an interplay between the semantics of the ditransitive construction and the various conceptual dimensions of transitivity.