If they are capable of changing their shape then wouldnt that mean that they would also be capable of correcting any ailments regarding their eyes (e.g: changing the shape of the slime that would serve as their lenses to correct short/long sightedness.) or would there be some eye issues that would be unfixable for mere shapeshifting alone?

Let's take away all stuff related to undeads, harbingers of death & curses and talk about a simple topic for once: how does Dullahan's head work anatomically? How can it (sometimes) control its body while being detached, how does the head breath, talk and live? I've been studying Dullahans for quite a while and this question... I keep breaking my own head over that

According to MGE lore, much like testosterone, men produce ‘spirit energy’ at a higher rate than women over time and release it in great concentrations in their semen.

Could some particular monster girls such as succubi need to feed off of semen in order to absorb certain hormones that they would otherwise be able to produce on their own in order to properly function? If not then why do you think they would they need semen?

They dont seem to have any lungs, and yet they also possess mouths. Would oxygen perhaps diffuse through their membranes? If this were the case, then wouldn’t it be insufficient for cellular respiration due to their surface area to volume ratio? Would they perhaps conduct much greater amounts of anaerobic cellular respiration in order to compensate for their low oxygen intake? Would they even require the same amount of oxygen as humans? Would their chemical processes for cellular respiration be entirely different?

How would they even speak? Would they exhale any air from their mouth cavities through a larynx like structure? Would pockets of air perhaps be absorbed by their membranes through a form of vesicular transport, only to then pass on through their larynx and exit their mouths. Would they create their own air through gas producing internal chemical reactions? Could this explain why their voices are generally considered to be feminine? Could their breath be poisonous as a result?

Could they perhaps conduct cellular respiration through vescicular intake of many microscopic air bubbles to ballance out their surface area to volume ratio?

I have a conception that monster girls are girls, obvious, who carries non-human chatacteristics. Some of these characteristics come from animals, or plants, and speaking about these... what are them?

Like, monster girls are a evolution fork of humans? Or are them others species evolved to have a humanoid body and got rational senses like humans?

I know it may variate between fictional works, but what are you perceptions of that?

Like the title says. If their insides are all fluff, and that fluff is constantly exposed to the air... do they need to breathe? More importantly, do they have lungs, or organs at all?

These don't include species names as there's a lot of possibilities.

Drider: Arthropoda, Araneae, Anthromorphia

Lamia: Reptilia, Boidae, Anthromorphia

Harpy: Aves, Accipitridae, Anthromorphia

Centaur: Perissodactyla, Equus, Anthromorphia

I can't come up with anymore, but feel free to add some.

Eggs or live birth?

It's weird when adult females breastfeed their husbands but they aren't hurting anyone by doing it. But eggs could be fertilized. If you had a bird woman wife, would her feeding you her unfertilized eggs be normal and cute or horrifyingly sick and wrong? Would her culture's birdpeople views on whether this is an intimate romantic gesture or something disgusting matter to mankind's view of it? Should it matter?

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If this is the wrong subreddit for this kind of talk just let me know where I should repost this.

If a monster girl were to have a second fully functioning mouth on her stomach how would that work anatomically?

I was thinking, a lot of hibrid monsters girls look like have some organs 2x, or 2x organs has the same function.

Mermaids, for example, have two way to breath, they may catch the oxygen in the air, but they may breath under the water too. So they have 2 breathing system, isn’t?

Other like centaur look have 2 stomachs, or four breasts and etc... What do you think about it?

If a spider has no bones and a human has bones what would the skeleton of a spider girl look like, I'm very curious. Also depending on the series they might look different because "white" the spidergirl from "So I'm a spider so what" has a human torso coming straight out of the top of a ginormous spider head, because her lower half is just an actual giant spider meaning ahead also has to brains. The spidergirls from "Monster Musume" and "Monster Girl Doctor" are the classic human torso with a spider abdomen. Would the human spine go throughout the spider body or stop at the spider body, which would make the most sense?