Its orcs. They dont exist guys. It depends on the setting.
"It's fantasy! Anything can be true!"
And anything can be false.
All of your arguments are moot too if you retreat to "but it's just pretend!"
Maybe the setting has every orc exuding a pheromone that makes them attractive in spite of their ugliness. Except they don't in Forgotten Realms, and that's just cope.
You are telling me some women would not do that?
In our modern, hedonistic culture, maybe. In some medieval culture, "wild" or not, where the woman would have to stay with the beast and raise its children, very unlikely. To the point that it would make half-orcs unheard of.
Some barbarian female cavewoman in the middle of nowhere (that you specifically make up to explain away orc rape) screwing an orc or a kobold does not a race make.
As far as I know its kinda like Neanderthals and humans
I'm tempted to write this off as bullshit too the more I see shit like
Cheddar Man pushed. No, it's more like a human or a chimp mating with a gorilla. Which doesn't happen.
I challenge you to find a single woman who is willing to have a 600 pound furry monster potentially snap her neck for fun just to satisfy a kink. And there are 3.5 billion women to choose from. Now try to find that same woman in a small medieval village.
The real comparison you should be making is Indians and White settlers, or tribal Africans and their British masters. Except that Indians weren't muscle-bound monstrosities with green skin and fangs, and neither are most Africans.
The problem is, as you already pointed out, that Orcs aren't real. They aren't Indians or Africans, they're a monstrous
caricature of a savage, beastial foreigner. There is no "beautiful orc maiden" who will stick her neck out for John Smith. They eat humans, keep them as slaves and sacrifice them on bloody altars. Even if you had an Orc that could fall in "love" with a human and do this, it's unlikely the feeling would be mutual, or well-received by the Orc tribe. Even if you could conceive of a single case, it wouldn't explain any significant amount of half-orc births.
Per 1E lore, half-orcs are likely the product of rape from humans in captivity. 2E tried to mitigate this by referencing a story of a blind man who married an Orc woman one time - because that's how freaking ugly they are, and even a passible
half-orc is still an ugly human - but it was obvious cope, and little more than an exception that proves the rule. I'm sure you could even create your own tribal version of Beauty and the Beast (minus the wealth), or some cum bucket female wizard who artificially inseminates herself with orc semen, but that would still just be you projecting a sexual fetish into the world and not something that believably occurs in even 1% of half-orc births.
As far as I know its kinda like Neanderthals and humans, or shit that happens in Conans Hyboria. And its not like Lovecraft didn't did it as well. Degenerate half breeds.
How many human women today in Africa marry gorillas? Chimps? Just a percentage guess will be fine.
Again, in a modern, degenerate world full of decadence and diminishing morality, sure you might have one lunatic willing to do it out of gross perversion, but not in a medieval society and not when an actual pregnancy can result.