Just kidding…
We actually heard that the ban on Mass Effect due to the lesbian encounter was in Singapore, and that the ban was later lifted. Where did you hear that China banned it? ME isn’t on any China banned list we have seen.
Certain countries will always ban games or movies if they conflict with their religion, history, culture or even political agendas, but nothing that a bit of editing and releasing of country specific versions can’t take care of… Personally, we don’t think anyone should miss out on a lesbian encounter with a human and an alien… but then again, who are we to judge…