Girls Educational & Mentoring Services (GEMS) non-profit organization that gives support to young women 12-21 who have been sexually exploited. I heard about this program on the news, and the 20-year old reformed prostitue was inspiring. This program really encourages the girls to make a change in their lives and shows them that there are other opportunities out there. You can contribute to the cause by donating clothes, or money.
Check out the GEMS website