There seems to be some confusion, there are people here who apparently believe that HIV affects all demographics at approx. the same rates. It does not.
The demographic most affected is MSM....by many tens of times, the infection rate is also rising also rising, while the infection rates in all other demographics are falling.
I would be sheer folly and ineffective, to test and contact trace the whole population for a condition which is extremely rare amongst heteros, but an epidemic amongst practicing male homosexuals.

The agencies suggest VERY FREQUENT testing and contact tracing for the WORST affect demographics, but are prevented from doing so by a political ideology which places idiotic dogma before health or life.

Studies in some parts of the US, found that half of all homosexual "marriages" or civil unions, were "open relationships" containing several different sexual partners; the article(which I linked to earlier), suggested that this partner sharing, increased the danger of HIV transmission.

As I said earlier homosexual "marriage" will certainly not guarantee monogamy.