More women are not having children, according to a recent Pew Research Center report.

Nearly one-in-five American women ends her childbearing years without having borne a child, compared with one-in-ten in the 1970s. The most educated women still are among the most likely never to have had a child. But in a notable exception to the overall rising trend, in 2008, 24% of women ages 40-44 with a master's, doctoral or professional degree had not had children, a decline from 31% in 1994.

The Pew Center points to several possible reasons why the childlessness rate among women are rising in general. They include less social pressure to bear children and more acceptance that having children is an individual choice.

Why do you think women are choosing not to bear children?