Honestly Aoi, girl, I could careless if you married a dude or a woman, but my god if you’re so unsatisfied with your relationship that you still would cheat, maybe talk to him and be swingers instead of this. The fact she sounded somewhat satisfied (or maybe even happy I never know with this woman) doing what she used to do for Kaede for her husband. But of course all of a sudden we see that message from one of her side girls that we saw from her wedding, I won’t even give her benefit of the doubt that she hasn’t been doing girls in the side from time to time because she probably has been.
For all we know her husband may have done the same and they are totally aware of each other's activities. The dude don't have a face, we can assume anything we want.
Yeah I'm fairly certain that this is a non-monogamous marriage.