YSK That people with HIV who are on treatment can become 'undetectable' which according to studies shows that they cannot pass on the virus. Most people on treatment become undetectable.

DISCLAIMER According to the latest study no gay or straight couples transmitted HIV from their sexual partners with condomless sex over a 4 year period. However some people did contract the virus but proved through genetic testing that it was not from their partners. (They cheated). These results are based on participants with a viral load lower than 200. Viral load is how many copies of the virus are in your blood per 50ml. This can be higher than a million.