Thought I'd share, since my players seemed to think it was interesting enough.
A bit of a preface... the setting for the campaign is a sort of sandbox points of light setting built from the inside out, rather than the other way around.
In this setting, orcs rage and rape and kill and pillage and don't like humanfolk. Sounds stereotypical, right?
Well, there's a twist.
It began with a sorcerous acolyte of the goddess Melisandre the Enchantress, the patron of romantic enchantment, love, and magic. Orcs have always warred with humans. They just didn't get along. But moreover, they were an affront to Melisandre because they felt no love in more ways than that... to them, mating was simply a practical matter. The arousal for them comes from the notion that they are reproducing and creating new life. The creation of new orc life is the center of orcish sexuality, and love doesn't play into it at all.
Anyways, this sorceress, Ermisande, acquires powerful, secret magics and weaves a powerful curse, laying all the women of orckind barren. With this stroke, she hoped to rid mankind of the threat of the orcs forever. However, her plan backfired. The orcs soon realized that they could breed with humans, and that orc blood ran stronger than man blood. Basicallly, "half orcs" in this setting were more or less orcs. In their unified rage, they tore down Ermisande's tower and took her captive, using her to breed more of the orcs she so hated until the day she died. In the modern day, *all* orcs are technically half-orcs.
Essentially, in this world, orcs have a
biological imperative to rape and pillage and drag off the womenfolk of the humans.
The poor orc ladies, though, become even more poorly treated second class citizens, and always have to strive to prove themselves useful enough to be considered "worth keeping around."