Do you know better than Irenaeus?
Thanks for that, but do observe a single swallow does not Spring make.
So yes, we do know better than Irenaeus - just as we know better than Aquinas and Augustine on particular topics of which they were plainly mistaken.
Some ancient views were never accepted by the Magisterium or even contemporaries and were in time consigned to the theological trashbins of history.
Nor is it now accepted that Adam and Eve were mentally but children in terms of knowledge.
Aquinas explicitly rejects this view.
Regardless your conclusion did not come from Irenaeus, but from your somewhat personal and dogmatic stance that freedom from the shame of nakedness is due to naiivity over the role of the genitals.
Clearly there are other explanations for freedom from shame over nakedness and Irenaeus’s was never adopted by mainstream theology.
You do not today have any of the excuses that Irenaeus had for his sincere position some 1800 years ago.
You appear to have assumed there is only one self-evident view on this matter - yours.
There are not only other views on the matter - there are better ones and the Magisterium and tradition has clearly rejected the view espoused by yourself and Irenaeus.
Adam and Eve were mature adults with full infused knowledge.
They knew what their genitals were for and had no shame about it because they controlled their sexual motions fully.
After the Fall the body “had a law of its own” which embarrassed our Parents. Thus they sought to hide their nakedness.