It makes sense to rationalize that Quinn is more interested in a DIK mc because of what kind of guy he is. She likes those same qualities in Tommy, and when he starts acting like a bitch she calls him out for it.
But my point is, that library sex scene with Quinn, it's not about Quinn saying "yes" or "no", it's about the MC responding to her rejection.
She initially rejects the mc no matter what, like you said in your earlier post, she consistently rejects all help from everyone, but if the mc doesn't say to her, "Yeah, I get it. You're strong..." etc. she keeps walking.
But the conditions for that scene to play out favorably are not related to Quinn's response, they are related to the mc's response. If he's already fucked Quinn (you're right, I forgot to mention the prerequisite of fucking her on the mansion roof is also required), he's not in a "girly" relationship (sorry M&J fans, remember Maya only really likes you because it feels like you're a girl when you talk to her
), and you have a "DIK" nature, then he just talks her bravado down, if he hasn't done all those things, he wimps out and lets Quinn go.
It seems like a subtle difference but Quinn doesn't only reject a non-DIK mc, she rejects him no matter what. The non-DIK mc simply lets her go after her rejection, a DIK mc doesn't accept her rejection.
The discussion relating to this event should be more about why does the mc not talk her down if he doesn't match that criteria, but it's pretty obvious: Having fucked her already he's more sure around her (and it wasn't for money, it was mutual, that's why the Riona/Quinn threesome doesn't count here). Being a DIK, he's not intimidated by her, she is an intimidating bitch. And not being with M&J means he's not conflicted.
That's the pure logic of it. I definitely understand the notion that Quinn would only be interested in a DIK and definitely not a CHICK, but I'm an argumentative fucker, and I'm saying the outcome to this scene was in the MC's hands, not Quinn's.