@Cursegrind: While it's a lot less common in the modern day thanks to gay rights, gay men have slept with women since time immemorial, sometimes several women, creating large families. Sometimes it was done as cover, sometimes to continue the bloodline, sometimes because they didn't understand why they didn't feel satisfied with women, and a whole host of other reasons. This does not preclude them being gay. Being gay, at least from my perspective, is about who you want to be with, not who you are with. I can only imagine that all of this would hold true for Orcs as well. The Chief would do what he needed to until there were an adequate number of offspring, then most likely move on. Or maybe the chief is a bit more flexible/fluid in his sexuality and doesn't mind being with women, even though he prefers men. Whatever the case, a gay chieftain having numerous offspring isn't out of the question. Hell, even if he can't make himself do the deed, there are, shall we say, ways around that. At the very least, surrogate fathers and/or adoption would be viable for Orcs. Keeping it secret, assuming that were desirable, might be a challenge, but probably not impossible. If nothing else, there's always the rather direct route of...eliminating the evidence.
For virtually every other race you mention, you're openly projecting our-world values onto other-world cultures. I'll pick apart Nords as an example, but I really see no point at all in picking apart the rest, as I reject utterly the notion that we can assume that what happened in our cultures would necessarily happen in another, much less a fictional one which is under no obligation to follow any of our rules. Cultures don't always make sense to outsiders.
So, Nords: at this particular point in Nord history, yes, they're fairly conservative, but that may not always have been the case. It could be that they've always accepted relationships between any two people, regardless of gender, and it never occurred to them that it would be any other way. We don't know. If you want to make comparisons to our world, we have historical precedent in the societies of ancient Greece (The Sacred Band of Thebes comes to mind) and to a lesser extent Rome, as you mentioned. And, of course, there's Vikings themselves, since Nords are heavily based on Viking culture. I won't get into much detail here, as the subject would probably start violating forum rules in a hurry. Suffice it to say that male-male interactions were accepted after a fashion, though as noted above for Orcs, conjugal duties were paramount, whatever else you might do outside of that. But again, that takes us back to the question of whether we should assume that much of Viking culture was written into Nord culture. I expect not. If Skyrim's writers say that gender generally wasn't seen as relelvant to relationships, then it's their world and that's the way things work there, regardless of whether it follows comparable cultures in our world.
As for your second post, by the time an Orc has figured out the...errr...ins and outs of gay sex, he's probably got a pretty good idea how straight sex works and the fact that it creates babies. It seems rather unlikely his father would have to explain it to him, but even if he did, that's just as likely with a straight teen (or whatever age Orcs mature at) as with a gay one. Lacking formal education, knowledge will be rather spotty regardless of orientation.
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