All they had to do was make those supposed Caitians male. I originally thought make one of them a male, but I'm sure that would cause it's own problems and people would still say doesn't prove anything. I agree though, J.Kirk is highly sexual and open in perspective, especially in youth (he gets a big crotchety about stuff in the TOS films LOL).
Is this a true Caitian? She's a from some type of catlike race. She's from the animated series (obviously).