What would be the safest way to teach overseas?

I have been online looking for jobs teaching overseas, but I am not sure if the agencies posting jobs are legit. Not to be sinical, but I don't want to go some where and end up someone's sex slave. How can I be sure these agencies are what they say?

Public Comments

1. My Son was in the Peace Corps. They are everything they say they are! Best wishes for wonderful experiences!
2. It's "cynical." What do you want to teach? Look at the website of the professional organization for the subject you're interested in. If you have the degree to back it up, check out Chronicle Careers online.
3. Be careful cause there's alot of wrong people around some agencies, see if this agency is in the yellow pages and ask them for reference of other employees and check it out real good,I live in ARGENTINA at present,what kind of job do you do?. You should go to known agencies that are very important worldwide and check it on the web if they have offices in other country's. Whatever you do be careful and I wish you the best.