I mean, there's definitely "sexual content". You cannot recommend this game to children. But it has no nudity. Like, it's very much implied Mochi roughly BDSMs you, to the point of traumatizing your body, or that you have threesome with Beryl, but those scenes fade out. Is there "explicitly sexual content"? No. Is there a SEXUAL content, that's definitely sexual, but without nudity, sounds, only describing what's starting through non-explicit words? Yes. Second game has a lot of implied stuff, like Mochi getting wet from your fight.
Well. I can't say all that for certain, DD has a lot of variety. Maybe someone found something even more explicit.