Prostitution of children in the form of survival sex occurs in both undeveloped and developed countries. In Asia, underage girls sometimes work in brothels to support their families. In Sri Lanka, parents will more often have their sons prostitute themselves rather than their daughters, as the society places more weight on sexual purity among females than males. Jaffe and Rosen write that prostitution of children in North America often results from "economic considerations, domestic violence and abuse, family disintegration and drug addiction". In Canada, a young man was convicted of charges relating to the prostitution of a 15-year-old girl online in 2012; he had encouraged her to prostitute herself as a means of making money, kept all of her earnings, and threatened her with violence if she did not continue.