Like Kirk having relationships all over the place and they're never mentioned again after. It gives the show a slight cartoonish feel to it.
Which relationships are you referring to? The past lovers, such as Ruth, Janet Wallace, and Carol Marcus? Because why would
they be mentioned regularly?
Or are you referring to the numerous women Kirk reputedly seduces in TOS? Because all those incidents were duty-related and absolutely not "relationships". As I recall, he didn't do more than kiss most of the them, with Deela of "Wink of an Eye" apparently the one who Kirk was the most intimate with, in the line of duty, of course.