I think this is a fake story.500 HKD in Wan Chai joint? He should have noticed something is wrong.
Besides you will notice if there are spots on condom, it will tear apart or the holes will get bigger as you try to use it.
And if i were a married man, and if that happens to me, i would either shut the f up or go to police, not the newspaper.
Only accurate thing they wrote is you really need to wait for 3 months for an accurate test.
Even its true, i think the guy is %99 clean (he had been mongering for 10 years and once in a 15 days so it makes roughly 260 WG s), even a condom with holes offers some protection and he is not the receiving side.
I think it s just an urban legend.