Scientific consensus used to be that the earth was the center of the universe. That pregnant women smoking was acceptable (just 70 years ago). Scientific consensus is a nonsensical term because science is never an absolute. We're always learning new things and revising old ideas.
We all have a bias. We're human. If I am misunderstanding sexuality due to modern norms tied to incorrect ideas about property and agriculture (mostly generated for social control in a civilization that we were never designed for), that don't actually reflect the reality and dynamism of human sexual relationships, then I will make mistakes and end up unhappy with how my sexual life plays out. And I don't want to be unhappy and unsuccessful.
I have read the book, and thus feel qualified to talk about it. Give it a read and get back to me by private message if you like.
It's dangerous to assume you are somehow onto something which the entire scientific community got wrong, or even more absurdly, that there is some giant conspiracy covering up this novel idea that would change the world.
For every Galileo, there are a thousand assholes claiming something bogus like perpetual motion machines. Furthermore, the scientific community and of the scientific method is obviously much more refined that what it was long ago. The scientific method evolved through time, since Aristotle and even before, to the more empirical and experimental methods we see nowadays. Galileo was actually somewhere in the turning point and could be seen as a pioneer. Anyways, he was mainly persecuted by the church and religious community, rather than the scientific one.
The other point about smoking ignores the historical nuance as well. Humans are not clairvoyant. The scientific and medical community can't know about problems that didn't arise yet. Cigarettes that we know today really took off around the mid 90s. There wouldn't have been wide spread health issues associated with it until then. The first cigarettes were even designed to not be inhaled (like cigars). Anyways, when everyone was smoking and getting cancer and other health issues, there was a fight with the cig companies. Again, it's not really the scientific community trying to bar knowledge, but other spheres of influence.
Basically, this argument that the scientific consensus is sometimes wrong is disingenuous and is pretty much used by pseudo intellectuals to push their viewpoint.
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from IASIP comes to mind lol. Of course, the scientific consensus can change as new ideas and observations are brought forth and scrutinized by the community. That is exactly how it's intended to work. If the research has sound methodology and reproducibility, it will be able to get people on it's side. If the overwhelming majority refutes it, well, the likelihood that you are talking out of your ass is exponentially higher than everyone else being wrong.
I did not read this book, nor am I interested in any way. I read the summary and a few reviews from the goodreads link and have a decent understanding of the type of content. The other guy mentioning pop science was probably right on the money. One review even names a book called Sex at Dusk, which refutes the original book using the same sources, showing that the authors of Sex at Dawn cherry picked what they wanted from these research papers. Which one is true? I don't know. I don't care, lol.
None of this even has anything to do with NTR in the first place. I honestly fail to see even the smallest connection here. So if prehistoric humans were communal fuckers, we should take that as some kind of signal to fight against the expectations of monogamy? The fuck kinda logic is that? Besides, polygamy, cheating, swinging, willing cuck, and everything that happens in real life is not "NTR" as in the fetish.
If your girl cheats on you, then she cheated on you. If you get cheated on and the thought that comes to your mind is "FUUUCK, I just got NTRed," you have some issues. If she "trades up" because a better man came along, then well, you probably fucked up long ago or she a fickle hoe. That's just how relationships go sometimes. You didn't get NTRed lol. The keyword in NTR is "stolen." In the context of the fetish, it is also essentially tied at the waste with corruption and moral degeneration. We are talking about a good girl who is corrupted by some fucker, eventually leaving you (bonus points for leaving you a DVD of her training). She didn't sign up for this. She just can't help it because the female instincts overrides moral and common sense when faced with a alpha dick. The MC is of such weak mentality that he feels
jealous and sometimes aroused at this turn of events. If this kind of hentai shit happens to you in real life, you got some real issues.
People cheat all the time, yes. But normal cheating leads to break up. If you got cheated on, you would kick her to the curb immediately. You would be pissed off. You won't be jealous that she got dicked by some alpha dude. You won't stay in this abusive relationship. You won't be aroused. You won't feel bad for leaving this hoe. The girl also has agency in all of this. She's not being "stolen" by some alpha dude swooping in and molesting her pussy til she cums. NTR is a rather specific type of story that is constructed with maximum porn tropes and fantasy logic to make it hot for people who like this type of immorality. It's not a catch all term for any instance of a second dick appearing in your vicinity.