As for TOS being overtly sexual: Bullshit it wasn't,
Everyone one of those costumes was about tits and ass.
Its not just TOS, I was watching TNG yesterday and didn't realise how many times the camera just zoomed on Troi's breasts. I never really noticed it before.
I remember that episode where Wesley was sentenced to death where everyone was minimally clad.
And there was 7of9 and T'Pol's and Kira's one piece suits.
And there was T'Pol stripping off for 'therapy massages'. OK and the decontamination episodes of ENT.