Internet sex chat rooms
It also agreed to develop education materials promoting the safe use of chat rooms.
In a statement, spokeswoman Mary Osako said Yahoo will also enhance online users' safety by restricting Yahoo Chat to users 18 and older and removing the Teen category.
It's no secret that a lot of them need just a sex partner for one night, and actually no one can blame them for that.
The attorney general said his office will look at other Internet service providers that may have similar problems.
Although cyber sex may not be the same as 'real' sex, there are still real emotions involved.
You could feel guilty if the person you are having cyber sex with is not your usual partner, and if they find out they might feel very hurt.
And once you hit send, you no longer have control over what happens next.
Ask yourself: Sexual images showing under 18s are considered child pornography in the law.