Well put it this way. Jill is the ultimate princess virgin, and has no intentional sexual interactions until Episode 8. There's the accidental fondling that she lets go on for too long on the first date, and some additional fondling when making out here and there. But that's it.
But the player sees Jill naked before the MC does, and not just in the game proper.
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These are rewards for Episode 1, and while they aren't putting the girls on full display, they ruin the surprise, so to speak, for some. As for Bianca, I'm sure a lot of people were looking forward to the actual act of getting her naked, but then DPC just unceremoniously dropped this latest preview. I'm not complaining, it did its job well and got me excited to see what happens.