The one-in-eight American couples who face fertility problems are, if they pursue reproductive technologies like artificial insemination or in-vitro fertilization, inevitably confronted with the possibility of "selective reduction," where they will need to abort one or more fetuses in order to make a pregnancy viable.  For some, the decision is hypothetical and never needed.  For others, it is medically mandated.

But for yet others, it is a choice, and like any reproductive choice, it is complex, deeply personal, and ethically controversial.  The New York Times has published an in-depth, thought-provoking piece about the rising number of women who are choosing to reduce twin pregnancies to singletons:

Firm numbers on twin reductions are not available, but the number is reportedly rising: