Yes. At this moment MC does have a harem 3 immortal beings, fully aware, open and cooperating with each other, and yes, there are still several options to develop new relationships with main LI and side chicks. And MC does not really hide, or even give a slightest effort to hide his relationships. Well, he do hide, somethings, form some one, but not for a reason to get advantage in bed. His intimate relationships are open.
Kinda not sure, what are you expecting? Does MC declares full list of his previous intercourses before next one? No, definitely no. Does he goes around and fucks? Well it is up to you, actually.
It is possible in this game to have a mentioned above harem and have only real intimate relationship with 1 (one) girl in it. Bare minimum. Story locked.