What do you call the transformation sequences and their outfits? Do their boots really need heels? Why are their skirts so short? Why are they essentially wearing fetishized versions of school uniforms?
The Transformations are incredibly light on Sexualization compared to the majority of anime I've seen.
As for the uniforms, it went with the whole thing. A school girl becoming the a crime fighter, but still being a school girl. It should be noted as their powers continue to grow the outfits get more and more elaborate and they show even less skin then their previous versions.
Also, their boots aren't an issue. The only one that can really be made a case for is Mars and the fact she wears straight high heels.
Usage starts spending the night with Mamoru after the second arc...
And? We barely see them kiss let alone anything beyond that.
Them spending the night together isn't sexualitzation, it's a boyfriend/girlfriend who are already shown to be married and have a child spending time together.