This might be a bit off-topic, but why do so many R18 MMD works use characters with deliberately unattractive designs—like 罪袋, or grotesquely obese guys—as the male role? There are plenty of well-designed, good-looking characters available, so I honestly don't understand why these are chosen instead. Erotic content is one place where people want to escape from reality, so forcing this kind of realism into it feels unnecessary to me.
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This is an automatic translation from Japanese. Sorry.
To state my personal opinion, whether or not you project yourself onto male characters is a key point.
For example, "空/Aether" in the image has a story as the protagonist of Genshin and can be recognized as an individual character.
Conversely, "罪袋" is a character without such a story, allowing viewers to freely expand their imagination.
There is a clear difference here.
Furthermore, when you want to focus on enjoying female characters, having male characters from the original work on screen can often be distracting.
(Wouldn't it be different if Bulma had sex with a faceless man versus Bulma having sex with Goku?)
Regarding the use of visually unattractive male characters, it's important to understand that some people derive excitement from seeing beautiful women being violated by repulsive men.
There's a saying within Japan's otaku community:
「あなたの性癖は誰かの地雷」(Your kink is someone else's landmine.)
In other words, if you feel aversion towards such videos, it's best to simply avoid them.
Just stating opinions is boring, so I'll upload one of my favorite videos.
This isn't a perfect collection. (If anyone has other items, I'd love for you to share them!)
I'll also repost a video I uploaded previously.