Cute Demon Crashers is unique in my experience. Admittedly, I'm not an expert in the otome gaming area, but most (non-puzzle/time management) games I've played aimed at a female audience are either adventure, adventure+romance or romance+adventure. CDC is not about romance: it's about getting a girl some sex.
CDC bills itself as a game about "consent and feeling safe in intimacy", and focuses on Claire. We meet Claire as she's home alone and...somewhat frustrated. Then four attractive demons turn up and offer her no-strings sex. And that's...pretty much it. Claire can get to know the demons a bit and decide whether to have sex with one of them, and just how much sex she wants to have (there's a lot of emphasis on stopping at any time). But there is never a suggestion that this is a romance (the demons cannot form romantic attachments).
I think the last game I played where sex was the goal was Leisure Suit Larry in the Land of the Lounge Lizards (way back in the dark ages of gaming). But LSL was about convincing some woman (any woman) to have sex with Larry (or, apparently, just paying a prostitute - I only played the beginning of LSL), while CDC is pretty much a beginner's guide to sex as a mutually positive experience. I'm fairly sure it's also the only game I've ever played that (depending on the route you play) provides imagery of an erect penis (not hidden as towers in the background).
Anyway, I think this game will be a gift to tween girls worldwide, and it amused this non-tween too. We've come a long way from Larry.