I don't think there's an easy way to search games like that here, but I suppose what you're looking for are nukige, which, according to VNDB are visual novels that are "focused on the erotic content, the storyline and characterization (if any) play a secondary role, and only provide setting for the sex-scenes. Plot serves the sex-scenes, not the other way round."
As such I could redirect you to this
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, where you can probably pick one with a higher "score" (meaning how much the nukige tag applies to it), and then try to find it here. Many of the ones in that list that exist in English can also be found here on F95.
The first from that list I'd check out would probably be
EROGE! Sex and Games Make Sexy Games, which I remember enjoying when I played it long ago.
If you're looking for something less anime-looking... I'm sure someone will come along with a whole list of games soon enough. I suppose if I had to make a recommendation in that case, I'd go with
Sisterly Lust, but I don't know if that's story-free enough for you.
Anyway, good luck for your search.