It's the classic double standard on here, man fucking women you're pursuing = Bad
Women fucking the women you're pursing = Hot
People find hot what they find hot. You may not like it, but I don't have any problem with it, for example. It's not exactly a double standard.
Scenario 1: The other woman is attempting to steal the LI away from the MC.
Scenario 2: The other woman is merely sharing equally in pleasure between the other members of the group sex. These are not the same scenario, and so they might bring different feelings from a player, depending on their view of things. Now, you might hate both of those equally, and that's fair. It's also fair to say what Rhonda does with the MC's mom is in NTR territory. However, the two scenarios I listed above
still are not the same thing, even if you find both equally detestable.
I feel the same way about a male participant. If he's not trying to steal the LI, that would be sharing and not NTR. Again, you might hate both the same way, but they are not the same thing.
Where it might become a double standard would be
why someone is OK with sharing an LI with a woman vs. a man. If the reasoning is that someone is straight and so sharing with the same sex bothers them, that wouldn't be a double standard: the issue they take is with the person's sex, not with the sharing itself. However, if the reasoning is instead that sharing with a woman is hot or that she's less of a potential threat or something similar, clearly that's one-sided and so a double standard.
Personally, I'm neutral on the MC sharing with either a girl or a guy, depending on the scenario. I'm also neutral on NTR: going into a game, I decide what I imagine the outcome being and then play accordingly.
However, I also see nothing wrong with objecting to things like this that you don't like. You feel how you feel. I just fail to see a "double standard" unless it's very specific reasoning that causes the conflict of consistency.
Also, it would be great if these sex scenes are spend out, my god that's a lot of fucking. Can we have some actual dialogue and conversations?
Agreed. Going from sex to sex to sex leaves little room for character development or story. At the evening party was sort of all the same thing: blueballing until the final culmination, so I had less issue with that. But there still was plenty of (too much) going from one romp to another.