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Questions tagged [sex]

For questions relating to sexual reproduction and the physical acts of mating that sexual beings engage in.

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2 votes
3 answers
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Would a species with 3 sexes be more adept at warfare and hard labor compared to humans? [closed]

For my fantasy story, I was trying to conceive of a three-gendered species for more uniqueness. I finally thought up an idea that might make biological sense. For mammals, the male sex has the sperm ...
Rhymehouse's user avatar
  • 4,525
0 votes
1 answer
96 views

Can a species transition to ZW from XY (or vice versa) sex determination system through evolution?

In my world, there is a species descended from green iguanas (Iguana iguana) that has ZW sex chromosomes rather than XY like all other iguanids. In the XY sex determination system (which is used by ...
mammifereviolet4694's user avatar
3 votes
4 answers
257 views

Would gender segregation of bathrooms, locker rooms, and prisons make sense with a limited mating season? [closed]

In my world, the main sapient species are Naledis. Naledis are similar to humans, but they are smaller and have cartoon-like features. Another large difference is that Homo Naledis have a mating ...
Rhymehouse's user avatar
  • 4,525
-5 votes
2 answers
228 views

Is it possible to have a species where everyone is both male and female? [closed]

I'm trying to create a humanoid species where all members can both impregnate each other and carry children. Each member would be sort of interchangeably male and female, in the sense that they could ...
www's user avatar
  • 1,525
5 votes
2 answers
281 views

Why can magic users only expel excess magical energy via sexual means?

I am developing a unique magical system for my world, and I’ve introduced a concept involving magic users, Fjǫlkunnugir, who possess the extraordinary ability to manipulate mystical energies called ...
Tiarnaard Cheannasach's user avatar
3 votes
0 answers
191 views

Which environment would favor sequential sexes as default? [closed]

A couple of years ago, I posted my idea of diachronic hermaphrodites as an answer. In brief, an alien or fantasy species of sentient humanoids goes through up to five phases in life: presexual kids, ...
Crissov's user avatar
  • 2,839
1 vote
1 answer
214 views

How would sex chromosome inheritance work in a tetraploid trioecious species with the ZW sex determination system?

I imagined a trioecious angiosperm species descended from common cocoa trees (Theobroma cacao). Trioecious = three sexes (male, female, and simultaneous hermaphrodite). They use the ZW sex-...
mammifereviolet4694's user avatar
12 votes
9 answers
7k views

Is it biologically possible for one species to need another species to reproduce?

I'm writing a speculative story about a planet in another Solar System. On this planet, there are five types of reproduction strategies amongst the sapient species. There are androgenic, gynogenics, ...
Rhymehouse's user avatar
  • 4,525
7 votes
1 answer
319 views

Can two species from the same genus but with a different sex determination system interbreed and have fertile (or at least sub-fertile) offspring?

In my futuristic world, there are two coelacanth species that are the daughter species from the famous West Indian Ocean coelacanth. One has the XY sex determination system (like humans, iguanas, ...
mammifereviolet4694's user avatar
2 votes
3 answers
642 views

Could cocoa trees evolve dioecy?

In real life, cocoa trees are famous for being hermaphroditic angiosperms from the Rosid class that are extremely bad at reproducing (they can be considered the giant panda of the plant world!). Also, ...
mammifereviolet4694's user avatar
14 votes
11 answers
5k views

Can selective breeding maximize human intelligence without major complications?

I am writing a story about an extreme meritocracy that applies artificial selection and eugenics to humans. This society (called Sophia) views intelligence as the most important trait to have. Almost ...
Rhymehouse's user avatar
  • 4,525
11 votes
15 answers
8k views

My Medieval kingdom has birth control, why is the population so high?

My world is roughly the same as the middle ages but has a natural form of birth control in the form of a root that can be grown and consumed to prevent pregnancy. Because of this root, opportunities ...
Bryan McClure's user avatar
0 votes
1 answer
319 views

Is a species that mates by "tribadism" possible?

In real life, there are planarians that are hermaphroditic, which means that they produce both eggs and sperm, however, they have penises and scrotum without clitorises and vaginas. They sexually ...
mammifereviolet4694's user avatar
7 votes
8 answers
5k views

Can I have a world without females?

In this world, most things that could be considered animals or animal-like reproduce in a genderless, sexless, or asexual manner, primarily through processes like apomixis or other means excluding ...
user avatar
0 votes
0 answers
49 views

Virus that affects only males? [duplicate]

Furrious Rabies affects only males in this universe, in our real universe it affects both genders. in our real universe I've never heard of any virus that only affects people with Y chromies. So I'm ...
Alve's user avatar
  • 17
3 votes
8 answers
564 views

What is a plausible sex determination system with males, females and multiple hermaphroditic sexes?

EDIT: I unexpectedly had a possible solution to this come to me, and posted it as answer here. Please look it up and give feedback on it. I'm trying to come up with a plausible sex determination ...
MarqFJA87's user avatar
  • 821
4 votes
5 answers
523 views

Would an asexually reproducing Humanoid species have any form of romance or sexual pleasure?

So I have a setting where the main sapient species is a very closely Humanoid race. In this setting, Humans, along with many other species across a number of dimensions, are all descended from an ...
Sl0wDeathUI's user avatar
-4 votes
3 answers
269 views

What effects would banning opposite-sex mating have on sexuality? [closed]

A load of children/teens developed magic mutations, so the government kidnapped them and locked them away for life. Due to the magic the kids can't be sterilized, and for economic and scientific ...
Ichthys King's user avatar
  • 16.2k
-5 votes
1 answer
145 views

Is it biologically feasible for a humanoid species to have both types of germ cells?

I thought up a race of humanoids called Daemons for a Homestuck-inspired video game/webcomic. I won’t go into a ton of detail about them, though if I wanted to, I could fill up nine whole questions. ...
Jobah_HigherMind's user avatar
1 vote
1 answer
220 views

Can a species with the ZW sex determination system be viviparous?

I imagined a hypothetical species of squamate from the Anguimorpha clade. They are my dragons. They are a rare example of viviparous nonmammalian tetrapod. However, like all anguimorphan squamates, ...
mammifereviolet4694's user avatar
2 votes
3 answers
2k views

How many generations could a small group go without suffering the effects of inbreeding

With a group of twelve human couples stranded on a island, how many generations could they go before becoming infertile due to inbreeding?
Bryan McClure's user avatar
-6 votes
3 answers
235 views

Why would dyadic cisgender women with facial hair be considered attractive? [closed]

In my world, there is a revolution in the world of fashion: women, men, non-binary people, and genderfluid people all must have facial hair if they want to be among the elite models. To be exact, men ...
mammifereviolet4694's user avatar
-1 votes
1 answer
317 views

Would these centaurs be able to copulate with their human genitals? [closed]

The centaurs externally appears very human-like. They have human-like hips with regular genitalia in their natural place. The horse body is similarly sized to the human body, and is connected ...
Ichthys King's user avatar
  • 16.2k
4 votes
5 answers
499 views

How can my sapient sea-star centaurs have four different sexes?

The Cochlequestrians (from the Latin for “snail horse”). are a sapient species much older than humans. They have much more advanced technology than other sapients. They resemble Pierson’s ...
Jobah_HigherMind's user avatar
3 votes
2 answers
422 views

How could a species have two sex-determination systems?

I imagined a tetraploid species of teleost. This species has both XY and ZW sex-determination systems. I call this strange thing the VYW sex-determination system. Genetic females have three V ...
mammifereviolet4694's user avatar
-3 votes
1 answer
359 views

How does interspecies romance work between fantasy races? [closed]

In my world, most of the fantasy races are very different from the typical. While there are some like ghouls, trolls, etc., there are animal people races instead of elves and dwarves. At some point, ...
Crafter's user avatar
  • 2,601
4 votes
3 answers
181 views

How long would a species have to have this brain symbiote to prevent early puberty?

So, a race of sapient aliens I designed for a series of short stories owes its sapience in part to a symbiote which lives in their brains and produces hormones that induce the brain to grow faster and ...
Choroflorocarbon's user avatar
3 votes
5 answers
486 views

Would lack of sexual dimorphism negatively impact a brutish humanoid species

In the world I am making I am wanting to portray the orcs as a race of testosterone filled and fairy hating frat bros, where the only difference between a man and a woman is the thing between their ...
Kurtalmakthekoboldkiaser's user avatar
20 votes
15 answers
7k views

No one wants to reproduce because it's disgusting, how does the species avoid extinction?

One of the species in my world is very asexual. In this species, males and females are rarely if ever attracted to other individuals. It is something that developed through the past few decades and ...
Drien RPG's user avatar
  • 383
-3 votes
5 answers
1k views

Why would dyadic cisgender women with a huge belly be considered attractive?

In many modern cultures, the double-cherry-shaped dyadic cisgender woman is help up as the epitome of attractiveness. In my story, there are sixteen species of the Homo genus (humans) that can all ...
mammifereviolet4694's user avatar
8 votes
2 answers
433 views

Choke on the bitter fruit of my demise

In death a new beginning is certain, for the jaws that bit my flesh will suffer a tragic end and no amount of laments or tears will ease the pain. My blood will flower and fruit inside their bodies, ...
user avatar
1 vote
2 answers
264 views

Complications from drafting human breeding stock [closed]

We all know about the various obsessions of the kings from olde times... Some women liked bathing in the blood of virgins, well ex virgins after watching them being raped by guards and animals...some ...
user avatar
0 votes
6 answers
303 views

Winning the game of life

all lifeforms alive today want to live and reproduce as much as possible, because those with differing ideas are extinct or about to be. Clearly the meaning of life is nothing else but to keep your ...
user avatar
5 votes
7 answers
672 views

What biologically would cause enforced sexual monogamy, and what could reverse it?

This idea came to me after reading up on the relationships of the prairie vole and the research done into why monogamous pair-bonding occurs. What I'm looking for in my story is biologically enforced ...
Teanna Schmaeh's user avatar
2 votes
4 answers
336 views

Does attractiveness naturally change every few years in medieval settings? [closed]

120 years ago being skinny was seen as unhealthy ugly and diseased, a sickening gross look to be skinny, women were actively shamed for that. 50 years ago dark skin was gross. then people started ...
user avatar
1 vote
2 answers
260 views

Single-sex species that has specific culture roles for different body types? [closed]

Basically what the title question says. I want there to at least be three socially constructed genders, each with their own expectations of how they should act and dress. I want the species to have a ...
Lunar A. P.'s user avatar
1 vote
0 answers
223 views

An intelligent species needs same-sex intercourse. Society Effects? [closed]

For one of my Damarian species, the Avari (Felinoid obligate carnivores), they need same-sex intercourse of both kinds to increase chances of conceiving. For females, they can increase their ovulation ...
The Darke Lorde's user avatar
8 votes
5 answers
870 views

How would it feel for a woman to be placed into a male body? [physiology only] [closed]

There are plenty of sex differences in human physiology: Body composition, skeleton, hormones, sexual organs, sensory systems, etc. My question is: How would it feel for a woman to be placed into a ...
Otkin's user avatar
  • 6,665
5 votes
7 answers
7k views

Stigma of virginity and chastity loophole

In my world there is a theocratic empire where all the citizens of the empire, when born, have stigma of virginity and chastity engraved on their bodies by the goddess of love. There are only two ...
TheStigma's user avatar
  • 115
2 votes
3 answers
377 views

Alien vixen on the hunt for sperm donor rewards

Sorry for the slightly X-rated question, I have an alien vixen, like a bounty hunter but her game is those rarest genomes for the sperm donation clinic, she can lure her males but the issue is about ...
Roger Harris's user avatar
10 votes
3 answers
2k views

What would be the most comfortable position for mermaids and humans to engage in sexual relationships?

Alice the mermaid and Bob the human have been dating each other for quite some time, and being young adults filled with love and copious amounts of hormones the two of them want to take their ...
user2352714's user avatar
  • 13.9k
1 vote
1 answer
235 views

Can faces be considered sexual? [closed]

Let's say there's a culture of people which never show their faces, except from when eating, but they only uncover their mouths and only with family. Otherwise they never show their faces to anyone. ...
user82040's user avatar
12 votes
7 answers
4k views

How would interspecies lovers with alien body plans safely engage in physical intimacy?

Now I had previously asked how a loving interspecies couple would work around very Alien Body Plans that is now sadly closed (How will interspecies lovers overcome different body plans?) That question ...
Jacob Badger's user avatar
  • 2,333
0 votes
1 answer
370 views

Human-Alien Hybrid Babies (18+) [closed]

Okay, I have stories with interspecies sex, complete with viable offspring. What kind of gene editing would be needed for that to even work, and how would the resulting child's genes be expressed? And ...
TysonDennis's user avatar
  • 2,380
11 votes
7 answers
1k views

How different can an alien be from us if it is possible for us to have sex and procreate?

Aliens have arrived to Earth from the depths of space, and thankfully they are peaceful and only want to learn about us and interact with us. Despite some initial trepidation, first contact goes well ...
Jimmery's user avatar
  • 6,081
3 votes
2 answers
541 views

Is there a real-life intersex condition that leads to functioning ovaries but with some male secondary sex characteristics?

One of the main characters in my story has an intersex mother (dead by the time of the plot). She was assigned male at birth due to her prominent penis that led a physician to conclude that she may ...
1995inHUN's user avatar
  • 604
50 votes
18 answers
10k views

I have a superpower that no-one can say "no" to me. How can I get informed consent?

I have a character who has a super power that gives them what can be best described as perfect pheromones, and when in their presence, anyone will volunteer for anything they want. (Eg in existing ...
Ash's user avatar
  • 44.3k
2 votes
3 answers
231 views

Wings going from locomotive purposes in juveniles to sexual purposes in adults, plausible?

So I thought about how my dragon-like species would get it's wings between the arms and legs and I figured that this would be the evolutionary path for such a creature: Hexapodal ancestor -> ...
Caters's user avatar
  • 4,165
4 votes
1 answer
108 views

Linking genetic sex to a set of climate adaptations

My world is fairly chaotic, with the same 2/3 of it being completely broken up and remade in chunks such that the whole 2/3 is always completely different than it was ten years ago. So once species ...
Carduus's user avatar
  • 2,252
8 votes
5 answers
3k views

What would cause vampires to become aroused when feeding?

I know that vampire bites could be very...erotic in most fictions, mostly due to proximity and intimate nature; more so with a human partner and it's heavily empathised but I'm wanting to understand ...
SKKennell's user avatar
  • 1,713