Incest

HP_TECH

Assuming the above verses is factually true.. (With no metaphor injected into the story)

Then the "Malaka" must be an earlier sentient being compared to human..
They can see and understand that the species of which "Adam" belongs to has the habits of being aggressive and killing each others in a conflict.
A consistent observation to the habits of (even today) human and earlier hominid. (as they're naturally a hunter / predator)

Perhaps the Malaka was questioning why choose among the aggressive hominid and not the peaceful and vegetarian Bonobo?

This "Adam" was told to master the art of "naming" which basically associating a concept or thing with an audio / sound symbol.
The entire objective of "naming" is to make COMMUNICATION through exchange of sound easier towards one another.
This implies that this "Adam" was not alone.. there are "others of his kind" where he practices the art of exchanging audio / sound symbol for exchanging thought or idea.

The "Malaka" might not know the "audio / sound symbol" of thing or concept...
It's not because the "Malaka" are stupid being..
It's because THEY DON'T NEED TO..
The means of communication among Malaka is not through exchange of audio / sound symbol.
Perhaps it's through "Telepathy"..

If Human does have the natural ability of "telepathy" then they don't need to know the audio / sound symbol of things either..
As Telepathy is a much clearer and better way of communication, compared to exchanging audio / sound symbol with each others (a.k.a languages)

As of now we have evidence of something named as "Mitochondrial Eve" through tracing of DNA of people living today.
Mitochondrial Eve is the matrilineal most recent common ancestor (MRCA), in a direct, unbroken, maternal line, of all currently living humans.
https//en.wikipedia.org/wiki/Mitochondrial_Eve

Definitely she was not living alone... there are others of her kind..
She has mom and dad too...

What we are doing now can be considered telepathy. Or are you hearing sounds from our words?
Totally irrelevant to the OP though I think.
Bonobo really?
I think All we are doing here is speculating aimlessly.

I think the OP is not seeking for consultation from the community on a matter.
The OP is seeking to propagate doubt.
The Way of Allah does not change and there are no contradictions in His Words.
Which means it has not reached you in knowledge what has reached others.

I would recommend for the OP to seek to better grasp this topic on his own through thorough reading from A to Z if this is a true concern of his and seek increase in knowledge from Allah through patience and prayer.

Because I do not believe the OP is contemplating marrying his siblings or anything of the sort.

These kind of questions are not relevant to the improvement of the community but rather is a form of entertaining doubt and inventing conjecture.

Just accept the fact that we were not there and we might not at this present state understand completely what occurred before but in truth the answer is there for those men of understanding.

The reason why the Angels knew or how we spread are not an obstacle for your maintaining of the salat and giving of the zakat.

So do not ask that which if you ask would trouble you before that the Quran is recited.

reel

this seems only an issue to those who believe in the sectarian tales

Problem is that even bible endorses such tales. It is popular worldwide. On the top of that scientists have not found all the missing links. The two can leave us in dilemma. The credibility also suffers from certain myths people take up in the name evolution. There you go

Busted! Gender Myths in the Bedroom & Beyond
http//www.livescience.com/16594-busted-gender-myths-bedroom.html
Examples from the link

Men want "sexy," women want "status"
Men want many sex partners, women want far fewer
Men think about sex more than women do
Women have far fewer orgasms than men do
Men like casual sex more than women do
Women are pickier than men