Would you guys who thought the lesbian scene was OK feel the same if it had been two dudes tongue-swabbing each others tonsils?
Just my two cents here:
A. In terms of fiction, it wouldn't really do anything for me, but no, it wouldn't offend me. If it's real life then what two consenting adults do is no business of mine, or anyone else's, in my opinion (granted, this is not the the place for that, so my apologies for going off course).
B. No one is forcing me to watch it even if it did offend me. If it did then I could skip past the scene, turn it off, leave the room and do something else, etc. The folks who made the content are free to put whatever they want in it, and I'm fre to consume it or not consume as I want. I would agree that it felt like it didn't add to the story one way or the other. As for Jeremiah Jones's comment, I'm inclined to believe that you probably did have instances of people in the past turning to the same-sex when there weren't many options, though that's just my gut assumption. I don't know of any records or facts that back it up or disprove it.
I'm sorry it offended you and your wife.
To get back on topic, I finished the series the other day. On the whole, I liked it, notwithstanding a few issues and the odd detail that was off, like the "1873" 1866.