The answer to most of your questions are, they are not cats.
Miqo'te are cat-like, yes, but they don't have super powers over this.

As for the over-sexualization, Seekers of the Sun are generally in a long waiting lineup before their breeder male gets to them. So they uh, gotta release the heat, you know.
And after some...close inspections, they don't seem to have fur hidden elsewhere, no.