Donum Vitae on homologous interventions: is IVF-ET a less acceptable gift than "GIFT"?

Donum Vitae argues that, by failing to respect the connection between the conjugal act and procreation, in vitro fertilization-even in the homologous or "simple case", where both gametes come from a married couple and the resulting embryo is transferred to the wife-shows itself to be morally unacceptable. On the other hand, the document refers approvingly to other technological interventions which "facilitate" or "assist" the conjugal act in achieving its objective. Although none of the latter interventions are mentioned by name, the recently developed gamete intrafallopian transfer (GIFT) and certain associated techniques have found favor with many orthodox Roman Catholic thinkers, as well with some church authorities. The present article explores this situation in the Catholic moral tradition, and offers reasons for believing that, given relevantly similar conditions, if GIFT is morally acceptable so also is homologous IVF-ET.