I am having sex with one girl many time cause aids ah , what to do?

I don't understand: I'm not sure i understand your question. You should always use condoms for protection against HIV and other std's. If you have had unprotected sex, see your doctor for std testing. You should have std testing any time you have a new partner, and they should get tested as well. Be responsible and use protection!

SEX: The bigger story here is that having intercourse with a female leads to pregnancy. Are you ready to be a father? There are twelve common stds. To get an std the partner has to be infected with that particular std. It is your responsibility if you are sexual to know these diseases, how they are prevented and when to test. It sounds like you need to get to the doctors office for testing.

HIV: You cannot acquire HIV infection from somebody who does not already have the virus regardless of how many times you have sex with them. If you are not sure, the best thing to do is to protect yourself with condoms, and although these are not 100% effective the only thing that is perfect is abstinence.

Is she infected?: Dr. Killian has given you good advice. If she is not infected with the HIV virus, you can make love as many times as you can / want to and you won't get aids. You'll do well to read a good book or two about this important part of being an adult.