People got married and somehow the babies appeared

I didn't think about it pretty much before learning about sex.

My parents had a book about sex, pregnancy and relationships. The pictures were mostly cold anatomical drawn stuff. I think the riskiest picture was just naked hugging from the waist up. Since I was too young to read, I assume my parents never bothered to hide the book.

It had pictures showing the baby growing inside the womb. So I learned early on that babies come from women. It never occurred to me ask what triggered it, I think I just assumed women chose to do it or something. It wasn't until 4th grade that I had a proper class about reproduction at school and learned the man's involvement.

Women became pregnant simply because they loved a man and were loved back for a long time.

I must have heard the expression "they slept together" and figured sex was something that happened when both people were asleep in the same bed

It came together shortly after I saw mom "wrestling" with my uncle

Not sure if this breaks the rule but I didn't see any rule against nsfw questions

It grows in mummy's tummy. Some say daddy puts it there but I don't see a practical way to do that so I'm discounting it. I've been burned before with that Santa nonsense so I'm not falling for bullshit a second time.

I used to think the baby growing process starts right from day 1 of marriage without doing anything.

In my culture, the groom and bride share a glass of milk on the first night of marriage. I thought that a woman drinking from the same glass as a man lead to her getting pregnant

In my SEA culture, we pretty much know about sex fairly early because we don't consider it "dirty" (though it was drilled early on that extramarital sex is bad because the parents and baby will be treated as outcasts). The actual copulation act is not talked about until you're around 12 y.o. or so, but it is generally known by children that married people go "sleep" with each other, have "fun" and then the wife gets pregnant.

I thought they were created by grey aliens

Well, I saw pregnant women, how the baby got there was a complete mystery. Right before puberty, there were wild speculations about what boys and girls do for the girls to become pregnant.

back in my youngest day, there's a place named mall and supermarket, where parents go and get a baby for them. nowadays, parents order babies on their smartphones and deliver by delivery service.

IIRC, mummy had to go to the shop to buy a seed to put into her tummy

Babies are delivered by a stork

I had a science book explaining bodily functions and all. They basically drew a bunch of tiny people operating the human body. Reproduction section was the same, which showed a male structure and female structure. I understood the mechanics but never really knew where this hole was in the body. That came in later.

I watched a looot of Animal Planet when I was a kid, so I didn't have many illusions. I could never figure out how the fuck birds did it, though. I figured that male birds must have extendable bits somehow, but female birds have a tail in the way.

We kept ducks when I was a kid, and during the time that we kept a mallard, he would straight up stand on the female duck's backs, and that struck me as terribly inefficient. To support this, none of the female ducks ever laid fertilised eggs, so I figured he was just terrible at it.

Little did I know about the horrifying intricacies of duck mating. I'll thank the internet for informing me in later life... Yeesh.

I never heard of some distracting story like the stork one. I can't remember when I learned about it though, I've "always known" it's done the way it is.

In Asia: our grandparents would tell us we were either picked up from the rubbish bin, or exploded from a rock

I kinda just thought pregnancy happened when two people were in love

I thought that babies were pooped out and that boys gave birth to boys and girls gave birth to girls, and I thought conception was sleeping in the same bed of a non-family member of the opposite sex. I eventually cleared up all my misconceptions, and thought it was low key unfair that women have to do both. I still feel that way tbh like why can't we just share the physical burden somehow, but not much I can do about it

I just thought when two lowers kiss, the woman would get pregnant. Pretty common.