What would a scene only available on low/no lust route be ? A chaste kiss? Failed rape attempt? Fully buttoned-up Amazon slaying her foes?
Well, this game starts with a 'lesbian' sex scene involving light BDSM play, suggesting that the female protagonist is in a commited, but also somewhat open relationship with some redhead. As is usual in the 'corruption' genre everyone around her will try to turn her into a grooling cum addict while she's desperately looking for the Holy Grail, Karen in this instance. The purpose of the game is to see that happen... or pretend that it's absolutely not the reason why one plays a porn game in the first place and enjoy so-so rounds of combat here and there.
In other words, it's a porn game, not the best there is, but indecent enough, not a dungeon crawler with optional H-scenes.