Oh man, this is a weirdly specific niche! While 'komik sex anime' sounds like a direct translation, I'm guessing you mean adult-oriented anime or hentai with really distinct visual approaches. Forget the generic, glossy stuff. One that springs to mind is 'Urotsukidōji: Legend of the Overfiend.' The art is rough, grotesque, and utterly nightmarish – it’s like a hellscape painting come to life, which fits its apocalyptic plot perfectly. You can't mistake it for anything else.
On a completely different aesthetic, 'Cool Devices' often had these hyper-stylized, almost cyberpunk segments with neon colors and sharp lines. It’s more of an anthology, so the quality varies, but some episodes are visually striking in a slick, cold way. Then there’s stuff like 'Bible Black,' which went for a more detailed, almost gothic realism with its shading and character designs, making the occult elements feel genuinely eerie. The art is the atmosphere in those.
Honestly, a lot of the most unique styles come from older OVAs from the 80s and early 90s, before digital animation homogenized things. They had this hand-drawn, sometimes weirdly proportioned look that’s full of personality. Finding them now is a chore, but the search is part of the fun.