Why wouldn't it be adequate or unbiased? It's not Nature, sure, but it's not even a magazine that would have an interest in portraying the female population in a negative light, considering that girls are the ones paying their bills. Anyway, here's another source that suggests a similar conclusion.Melinda Spohn, a social worker and researcher at Spokane Falls Community College in Washington, decided to study why so many of her clients told her that their pregnancies were unplanned, despite the variety of easily available birth control.
More than a third of women said they had risked pregnancy in the past with men who had attractive qualities—such as commitment to the relationship, good financial prospects or the desire for a family—but hadn't discussed the possibility of pregnancy with their partner. It was unclear how many women actually became pregnant.