Dominic Deegan dips into this on occasion. While ass shots of a woman who is freezing to death are fairly tame compared to the rest of this page, they're still kind of disturbing. Not to mention the ass shots of a woman after her death. Why is her ass raised like that? Is this supposed to be regular fanservice? May have been intended as a Karmic Death.
Exploitation Now has a brilliant use of this. Underage Villain Jordan had been the number one request for nude fan service for the length of the story arc, but when the artist finally did so, she was being raped by a former class-mate turned pathetic wannabe villain.
In this◊ episode of Looking for Group, we get to see under the dress of one of the main characters... It's the rotting undead male warlock.
Occasional strips where Abbey appears topless. Since Abbey is horribly malnourished, this is very disservice-y. The worst is definitely the first time, when Abbey is downright skeletal and her chest is rotting from the inside due to a bad case of Phlebotinum Breakdown. On later occasions she looks slightly better, but never enough to qualify for actual fanservice.
Not to mention later strips with the hideous growth of insectile wings protruding from her back.
Whenever there is nudity in Flipside, there is about a fifty percent probability it will occur in a not at all erotic context, for example Maytag being stripped and forced into a collar by a magically-enhanced psychopath intending to rape and kill her.
Terinu has a lengthy sequence with Gwen dressed in an "Exotic Dancer Barbie" outfit. In the very last panel we're looking behind her and she's standing half-naked in front of two ancient aliens literally twice her size, making her appear twelve years old instead of fifteen (which would be bad enough).
The Oglaf webcomics where there's constant sexual situations. The catch is, half the time it's a giant spider giving head, molten hot succubis (literally), etc.
One page featured fan-favorite Naal'suul for part of chapter 13 sans-clothing (though you can't see anything) the disservice comes from her body language and posture due to being imprisoned in a dark cell, and the fact that she's talking about the demon that already Mind Raped her once and will eventually take advantage of her again and kill her.
And a grown up Naal proves to be quite well stacked and gets a scene with her chest completely uncovered. Too bad she's, you know, a demon and her bottom half is made of the corpses of people she's absorbed over the years.
Nudity is frequent in Fairy Dust, but a large part of it is seen in races considered unattractive from human standards, or in disturbing situations.
In Misfile, there is a shot of a very attractive female character, fully-frontally nude, with only two very, very thin panes breaks hiding her nipples and crotch. The catch? She's in the middle of a majorHeroic BSOD because of that same body.
The VG Cats strip "Kinder Surprise" ends with a scene of Gabe Newell swimming in a pile of money, naked. Ewwwwwwwwwwwwwwww.
In General Protection Fault, Trudy has a dream of an... intimate encounter with Nick. When all is said and done, she calls out to him as they lie on the bed naked, only for him to suddenly be replaced by Ki, then Fooker, then Nefarious, then Todd, then Chuck, then her future self. Nefarious and her future self are old and quite wrinkled, and Trudy's future self has some horrific expressions on her face.
Goblins has Cute Monster Girl Saves leaning into a dome that makes everything within its volume invisible. Dies gets a brief glimpse of heaven as it clips through her shirt... and then he gets a look at her internal anatomy when it clips through her face and torso.
In this issue of The Word Weary, John, one of the protagonists is shown nude from the back as he gets changed. While in-universe it's shown that he's not a bad-looking guy, the detail of the hair on his back and buttocks is a bit squicky.
The Grim Tales From Down Below comic has a disturbing picture of an adult Mandy, and an even more disturbing dialogue, as Nergal mentions that the only way Grim could have an undead skeleton son was by aborting an actual infant.