Maybe the immature jackass Kirk of nuTrek would have done that...
Oh Jesus. What does nuTrek have to do with this discussion?
Just making the point that Kirk "high-fiving" the Vulcans if Spock and T'Pring had public sex is something that would be seriously out of character for TOS Kirk.
I have no idea where the poster got the notion of Kirk high-fiving anyone, and thought it could be from the Abramsverse, since that Kirk is a great deal less mature than TOS Kirk.