I really enjoyed your and
Cynicaladm 's posts, but here (in the bold parts) you seem to be contradicting yourself:
I would say that the MC is pretty emotionally detached on a number of levels. He's away a lot. He's involved with plenty of other girls, most purely sexual but some romantically as well. Yes, Zahra is involved with most of those, and she seems not to mind sharing the MC with other girls but at the end of the day, of the little time he spends at home, he spends most of his time with other girls. And even if he is physically available, he's not the most social kind of guy.
I don't want to advocate any NTR but Omar is in some ways clearly superior to the MC. He's more emotionally available and he may well be more powerful, all things considered.
But, if I may go a bit off-topic, being emotionally distant seems like a proper thing to do for a guy in his profession. In an historical context, I would say that in historical warrior cultures, men were likely to be much more emotionally distant than the modern femboys of today. But I would not say that back in the day, women were more likely to cheat on their "emotionally distant" men, for the reasons you cited.
I fully support your analysis of sexual relationships in a historical context though, and I also like the wording "sexually restrained" vs. "sexually repressed". Good stuff!