. . .Sulu kissing France Nguyen would have been out of the question. American media seems to have this strange idea that Asian males don't interact with females of any race including their own.
You don't seem to have a good understanding of American media with this comment. The film "Flower Drum Song" was released in 1961. I don't know if it aired on television during Star Trek's original run, but it's possible. And you seem to be completely ignoring the Sulu/Uhura scenes in "Mirror, Mirror".
During the 1960s, most non-white actors on television were in supporting roles as either bad guys, victims, or servants and menials. Star Trek, along with other series like I Spy and Julia, were all important in opening doors to non-white actors. But in those days, such actors usually weren't even considered for such roles unless it was specifically indicated in a script.