There's a lot said here and I agree with your point in the main, I don't think Maya is going to be crucifying MC for Quinn in future episodes.
Thinking about this got me curious. Why is it that Maya is the one who asks MC about his body count? (I hate that term, but I guess it fits)
She was the one who came up with the whole "no strings attached" setting when they first decided to try out their special relationship. So I would have thought this question would matter more to Josy. But I think it's only Maya who asks.
And why does this ding their relationship, at all? I mean, MC isn't really given a chance to ask either one of them what their body count is, right? And I don't see them volunteering that information, unless I'm forgetting something.
Anyway, I wonder if that was DPC slipping up a tad and meta-gaming a horndog MC a bit. That's what it feels like to me. It doesn't feel like a Maya question, at this point. Just an observation, not really a question. Ya'll's discussion made me think of it again.
Regarding why it's Maya who asks this... probably it was made to balance their questions and concerns. It would look and feel strange if only one of the girls was asking questions and the other was silent. Josy was interested in the MCs ex, and Maya became interested in the current sexual adventures of the MC.
On the other hand... you mentioned it was Maya who came with "no strings attached" proposal. In this case it fits quite well with her subtle bevaviour and probably with intention to "test" the MC, had he used this "no strings attached" option or he was sure in his choice more or less beforehand. And they look pretty happy if he didn't take advantage of it (who wouldn't be?). But in their situation, they are also happy if MC "tested other cars"
(с) Tommy before finally deciding to be with them. The first option is nicer and leaves a better impression.
So Josy got her part to concern for MCs ex. But both girls are interested in both topics, regardless of who asked it first, which again looks like a certain balance. Girls usually have a lot of inner thoughts when it comes to relationships, feelings, etc, while here there are 2 girls at once and they are also communicate in one or another way.
Regarding their "body count"... well... it's mostly "zero" or not mentioned visually. Because... you know why, lol. In J&M case - it's obvious that Josy was with guy(s) before the Maya, while Maya was only with Josy (at least in terms of sex), because Maya mentioned that she tried to date with guys in past, but it didn't developed into something. And in case with J&M it's also a 18yo kind of restriction, since Josy backstory definitely goes beyond 18. Among the rest of MGs... We know only about the Chad in case with Sage, Jill is virgin and Bella had(have) a husband, while most of SGs have more broad experience or they're prostitutes or some kind of.
Moreover, Sage
IS NOT in her last year.
She's in her 3rd year.
She started working on her thesis at the beginning of her 3rd year - of course she does - and she explains MC why.
1st year: MC, Josy, Maya, Derek
2nd year: Jill, Quinn
3rd year: Sage
Wrong, and Sage herself confirmed her last year several times in dialogues. Sage - 4th year, Jill - 3rd year, Rusty, Tommy, Nick - 3rd year. It's also perfectly fits with the game end, MCs 1st year and passing the torch regarding DIKs new president and VP. Chad is planning the same thing.