The findings suggest that women’s contraception use is far more likely to change in equitable societies, compared to men’s. In other words, when girls are given agency over their own sexuality, they use it. That could be especially important for young women, notes Aubrey S. Madkour, one of the study’s authors and an associate professor of public health at Tulane University in Louisiana, for whom unintended pregnancies can have major impacts on education and future income.