Half Orcs are a great example of both unintentional racism and the pervasive presumption of sexual assault in fantasy worlds. First "Officially" introduced in the Monster Manual for 1e in 1977, their description is... grossly racist.
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Orc society is blatantly sexist in the early days, with women existing exclusively to bear young. You never -fought- Orc women, you only slaughtered them and their children after killing the men in battle, like a -civilized- hero. References to Half Orcs being the "Unfortunate" result of raids between the two cultures (meaning humans were sexually assaulting orcs, too, because, y'know... horrible) are the prevailing story across various books and adventures.
3e kind of started toward breaking away with that when they made Half Orcs a core heritage for the PHB... but there's still a lot of references to raids and intentional breeding of Half Orcs in 3e materials. Like eugenics levels of grossness.
Not that it's limited to D&D worlds, either. In the Warcraft RPG they make a special note that half-orcs are "Almost always" the result of sexual assault.
4e moved a little further away from it, though explicitly had half-orc NPCs and example characters who were either outright stated, or heavily implied, to be the children of sexual assault.
And 5e has really gone the whole way of trying to get away from it by making half orcs often the result of frontier marriages to unite warring tribes... Because forcing your adult children to get married and have sex with orcs is -totally- not sexual assault or coercive...
Err...
Yup. The trope remains to this day about half-orcs being children of sexual assault perpetrated by members of one brutal species or another.