Ok Dave, just for the sake of this discussion, let's say that promiscuity rates among homos, are no higher than those among heteros.

Could you please explain the huge difference in new infection rates for all STD's

Is there some other answer? Something intrinsic to male to male sex perhaps?
The latest figures say 70/78% of all new infections amongst men, are from the MSM demographic, which comprises only 0.75% of the adult population; if we are serious about stopping the sexual health epidemic amongst MSM, it is imperative that we determine the cause of the massive over representation.

To say that such a massive difference can be put down to increased
testing in that demographic is obvious nonsense, so what's you take on it?

By the way, I don't include YOU in the "gang of three", I don't think you are in their grade, your head being in the normal position(not up your arse) :0)