As with domestic violence, it is difficult to obtain accurate figures of the numbers of girls and women in servile marriage. Statistics for early marriage, however, can be used as an indication. According to UNICEF, adolescent marriages (where one or both spouses are below the age of 19 years) commonly occur in South Asia and sub-Saharan Africa. In those regions, most marriages take place between the ages of 15 and 18 years. UNICEF suggests that early marriages are often considered to be a way to protect girls, and even sometimes boys, from sexual predation, promiscuity and social ostracism. In some communities, parents perceive girls as wealth.