pawsplay
Hero
As others have said, you can't really laugh about RAPE unlike even murder or slavery.
I'm black and my friends and I have joked about slavery and similarly, we've joked about murder. I just can't see anyway to joke about rape....
Just because this keeps coming up, reluctant as I am to address this subject, rape-for-laughs appears in Discworld, Yellowbeard, The World According to Garp, Tomcats, Revenge of the Nerds, and Young Frankenstein, and probably many others. I'm not saying it's wrong or right, I'm just saying, tvtropes.org has had a lot of ongoing discussion about Rape As Comedy. South Park and Family Guy, of course, reference rape all the time. Link to a whole article on the subject:
Rape As Comedy - Television Tropes & Idioms
Hopefuly we are now done with that talking point.
I think usmdw makes a good point. I'll argue further that vampires in RPGs have an overtone of rape, with infection (a blood-born illness such as, say, AIDS), and implications of incest.
I feel it's dishonest to draw a big HERE BE DRAGONS on the map and refuse to acknowledge the logical outcome of human-orc interfertility along with the existence of half-orcs. Logically, sometimes, somewhere, it must have occured. Probably not often enough or consistently enough to be produce a new "race," but surely it has happened. The thing is, most of the other backstories I can imagine, apart from the scenario of human-orc border towns, have unsavory elements as well. I don't think it's overreaching for an RPG to be mature enough to state or imply, "Some half-orcs are the result of consensual relationships, and others aren't." I think it's fine, too, if most half-orcs are the descendents of half-orcs, but you have to identify where they come from, and it's just hard to accept that all the original half-orcs were the result of loving, culture-crossing relationships. If you want to make them the product of magic and make them very much a separate race, that's an option, too.