With the exception of some rather chaste pairings of Anakin/Padme and Han/Leia, I think the entire series has had maybe 3-4 full on kisses, let alone anything more risque. Other than the Leia Slave Costume and maybe the incestuous kiss, Star Wars is pretty prim stuff.

far less than Michio Kaku

Kun Lun is an alien city, not an asian one, so would would the actor need to be anything other than as portrayed in the comic?

Gotta say, I'm a little sad that Ray Park isn't the choice. I know he was big into doing this a while back.