Prostitution law
However, sex worker activists and organizations distinguish between human trafficking and legitimate sex work, and assert the importance of recognizing that trafficking is not synonymous with sex work. The Sex Workers Alliance Ireland organization explains: "victims of human trafficking may be forced to work in industries such as agriculture, domestic service as well as the sex industry. It is critical to distinguish human trafficking, which is a violation of human rights, from voluntary migration." The Open Society Foundations organization states: "sex work is done by consenting adults, where the act of selling or buying sexual services is not a violation of human rights. In fact, sex workers are natural allies in the fight against trafficking. The UNAIDS Guidance Note on HIV and Sex Work recognizes that sex worker organizations are best positioned to refer people who are victims of trafficking to appropriate services."
Organized crime
Human trafficking for the purpose of sexual exploitation is a major cause of contemporary sexual slavery and is primarily for prostituting women and children into sex industries. Sexual slavery encompasses most, if not all, forms of forced prostitution. The terms "forced prostitution" or "enforced prostitution" appear in international and humanitarian conventions but have been insufficiently understood and inconsistently applied. "Forced prostitution" generally refers to conditions of control over a person who is coerced by another to engage in sexual activity. Official numbers of individuals in sexual slavery worldwide vary. In 2001 International Organization for Migration estimated 400,000, the Federal Bureau of Investigation estimated 700,000 and UNICEF estimated 1.75 million. The most common destinations for victims of human trafficking are Thailand, Japan, Israel, Belgium, the Netherlands, Germany, Italy, Turkey and the United States, according to a report by UNODC.