if a gal has been doing it with a guy for awhile... then she decides to marry him out of 'love' or 'practicality' or whatever. If she does the HIV test and finds out that her boyfriend has HIV, think her biggest concern would not be about marrying the wrong guy. Think she would be most worried that she also already contracted HIV.
Like that, it would be even better that they got married so they dont endanger anyone else, or they could get a free lover's holiday package to an unknown island called Pulau Mati or something.
But this method is good also lah.. It helps the government make testing compulsory for almost everyone at the sexual peak of a person's lifetime.
However it might lead to lesser marriages as now it is seen as even more pressurizing.