I think posts 2 & 4 from getbak and Locke pretty much nail it.
One other thing I could think of is a combination of screen time and budget.
Typically Season 1 has a smaller cast, less visuals, less sets, less action because of budget.
Often the Season 2 cast remains small and a less ambitious shooting schedule. because the stories were designed for the old budget paradigm.
Once you get to Season 3 you start to see big casts, more sets, more action, and it eats up screen time, because you have to let more people talk in the episode and you can go to more places, you don't need to keep the audience engaged in a 4 minute bedroom scene to fill the time, so there is less need to flash some boob.
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