Is Mass Effect promoting beastiality by letting you bone other species than human? Of course not, they're aliens, they're creations of fiction based on a combination of human and animalistic traits and aesthetics, same as the other species in Skyrim. No fantasy creature really strays that far from the human template; elves are just slightly shorter with pointy ears, qunari are slightly bigger and have cornrows or oversized goat horns and khajiit basically have a catface and are covered in fur. There really isn't that much distinction, basically they look and act a hell of a lot more like humans than animals, they are sentient, bipedal creatures capable of coherent speech and offering consent. Besides, it's a video game, people are capable of making distinctions between fantasy and reality and do things in the former realm which they would never practice in the latter. At the most all you can argue is that the game is furry friendly and while that's not really my bag, it doesn't bother me that it's being included.