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Round the corner, the woman's hands reach out to a pushchair carrying a toddler. The graffiti is part of a campaign led by Ammar, the first de facto trade union for sex workers in Latin America.
For the past 19 years the group has been fighting to change the way society looks upon prostitution and make sex workers aware of their rights. Ammar helped draft a bill due to be presented in the senate that would class sex workers as self-employed. If it becomes law, it would enable them to register with labour authorities, pay tax and get a pension. An advert showing a sex worker on one side of the wall and her tot on the other.
Photograph: Ogilvy and Mather, Buenos Aires "We wanted to show we are first of all women, mothers and breadwinners and then sex workers and that we need laws to protect us. Some of us chose this work and there should be a legal framework for it.
We need it to end marginalisation and to empower us," Georgina Orellano, an Ammar activist and former sex worker said of the campaign. Prostitution without pimps is legal in Argentina but Ammar activists believe the current legislation leaves sex workers exposed to police abuse because it does not establish any rights.
Harassed by police officers at every corner, many women end up trapped by prostitution cartels that exploit them. Given the growth of the illegal sex trade, Gustavo Vera, director of the Alameda Foundation , which campaigns against human trafficking, thinks such a law would be ineffective.