With many of the women being already understandable toward other women loving him, there really should be a more of a harem option
This is one of the reasons that I personally actually liked this story for having a defined character, Jensen Wenchester, as the hero protagonist, rather than a renamable 'player avatar' character. It lets us write actual personality for him, and to have other characters react to that personality. Without having that, the characters can be quite vague, barely sketched out, as it is impossible to know how any specific player may be seeing their character, and thus how to categorize their motives or actons, and how to react to them.
The simple thing is that Jensen doesn't really want a harem. He's a bit of a romantic, and wants that one, perfect relationship, because if he were the harem type, he'd have been too busy getting laid by every woman in the country courtesy of his super-pheromones to have even gotten involved in the plot. He wouldn't have wasted time on Adam, or solving mysteries, if he were the type who's main interest was just getting laid a lot. He had better than a harem, he had a super-power to get laid, and didn't regret for one second losing it.
Let me tell you something, just having a long-term mistress is one heck of a strain on anyone unless the primary relationship is just for show, and the reality is that the mistress is the real relationship, while the marriage is more of a business partnership. Keeping one partner happy (in the non-sexual ways) isn't easy, as the massive divorce rate tells us all. Two is more than twice as difficult. Ask anyone with kids what adding extra humans into an intimate relationship does to the intimacy.