Unusual request, so I did a search out of curiosity. Most are low-poly but not specifically PSX style. Most are short or abandoned. Note I didn't play them so can't comment if they're actually any good.
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: furry platformer with N64 style. Dev has other games
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: furry platformer, N64 style though with higher poly count
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: exhibition themed stealth game
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: time stop rape game
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: very basic dungeon crawler, play as succubus that rapes enemies they defeat
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: platformer, pregnancy fetish
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: Mine Craft fan game, though artist smoothed the models so it's not truly lowpoly. If you like the style though, dev seems to have done other things.
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: supposedly persona inspired game, so I assume it's dungeon exploration + dating sim
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: gay scalie game
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: tech demo touching game. Maybe keep an eye on the dev, they could make a proper game in future.
- Shady Lewd Kart: mario kart parody, game has lowpoly style, but sex scenes are 2d
Aside from that, some games use screenshots from Custom Maid 3D or the Sims, both are older games with lowpoly graphics. Examples:
Village of Nightmare,
Drawing My Life