 Men who had paid for sex were more likely than other men to smoke, to drink more alcohol, to have had a sexually transmitted infection (STI) or been tested for HIV, to have more sexual partners, to have first had vaginal intercourse before 16, and to have had heterosexual anal intercourse.The United Nations Programme on HIV and AIDS UNAIDS has estimated the number of sex workers in Australia in 2012–2014 as between 20–25,000.Scarlet Alliance, a national peer sex worker NGO, provides advocacy for sex workers in Australia.