Well, since we're shouting, I AM A FURRY! Hmmmm...now I feel like Loud Howard from Dilbert.
Anyway, I've never thought about it before but that's a smart idea to use an anthropomorphic or otherwise non-human character to avoid people bitching about race selection, and if gender is ambiguous then you can avoid people bitching about gender choice.
The furry fandom may have adult material to be found among the artwork, but the furry fandom overall is not sexually based. The fandom and being a furry is an interest and hobby focused on an interest and enjoyment in anthropomorphic cartoon animal characters and their artists. It doesn't matter what species or form you use; there will be somebody somewhere who makes pornographic fan art of those characters. There's Transformers robot porn, for crap's sake! The only way you can avoid it is to make a 1st person shooter type game where all the enemies are robots or hideous monsters, or a puzzle game with no characters at all. Since you're making a 3D action game there are sure to be characters in it, so you may as well resign yourself to the fact that somebody somewhere is going to make porn of your characters. It's called Rule 34: any porn idea you can come up with, somebody else has already come up with it first, if it exists then there is porn of it, and no character is exempt.
You might get away with something like Halo where everybody is wearing full body armor suits, but I can't guarantee there is no Halo porn (I really don't want to check on that). If you want to have anthro characters then make anthro characters; if you want human characters then make human characters; if you want aliens then make aliens. The important things you should be focusing on are the game's playability, challenge, being bug-free, replayability, audiovisual effects, overall quality, and player's enjoyment of it because all those things affect how much it sells and how much $$$ it brings in (the latest Modern Warfare just broke $1 Billion in opening day sales...damn!). The thoughts about after effects like fan art porn should be the last thing on your mind. A pornographic reputation due to fan art will come long after the sales of the game will have declined naturally and really won't affect its sales. Make a good game and people will ignore the fact they can see art of the characters getting it on.
I hope that's unbiased enough for you. As a very proud furry I really suggest you look into the furry fandom, meet more furries to get to know them, and learn about it beyond what the myths and stereotypes say it is. You'll probably find that it's more tame than the Star Trek or general sci-fi fandom, and much more tame than the Anime fandom.