And just how could there be "kinda, sorta, maybe" to a first mann and first woman with evolution?
I'll be explaining an idea I don't agree with, which is fraught with difficulty, but I'll do my best. Just be aware TEs may jump in and correct me.
In short the answer would be: evolution is based on individual organisms, not species. Species, while an accepted and useful biological category, is man made. The DNA of every organism (of every human) is different. There is no single DNA sequence that uniquely identifies a human as human. Rather, it is largely our morphology that is used to identify us as homo sapiens.
Of course the DNA of humans is all very similar, but never exactly the same. As it happens, our DNA is also similar to other species. So, there is no absolute method for saying where homo sapiens DNA starts and where it ends. Of course, due to the similarities and differences, a biologist could quite easily distinguish human from ape using DNA and be confident the observed differences in DNA would correlate with observed differences in morphology, but there is no hard and fast rule.
In the end, if two organisms can mate and produce viable, fertile offspring, there is a 99.999999999% chance biologists would classify them as the same species. They would also classify their children as the same species. It would be extremely rare and controversial (as far as I know, it's never happened) for a biologist to claim two organisms from different species mated and produced fertile offspring … or to call that offspring a different species.
To illustrate how the term "species" is somewhat fluid, consider the revelation that Neanderthals likely mixed with other
homo species. Rather than declaring two species mated to produce a new species, Neanderthals were downgraded (or upgraded, depending on how you look at it) to being called a human sub-species.
So, when two humans mate, it is always two organisms with differing DNA and they always produce an organism with yet another unique DNA sequence. Therefore, to identify one of those organisms as the first human male or first human female is not really possible within the evolutionary framework. And, to be honest, I don't think it's a detail evolutionists care about. About all a biologist will say is that at some point in the past, the organisms in the reproductive chain are not called humans. Then, at some point they are called humans. Where exactly the dividing line lies … no one knows … or cares.