Both Uses

platonic
in
Atlas Shrugged
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You're the man who would know that just as an idea unexpressed in physical action is contemptible hypocrisy, so is platonic love-and just as physical action unguided by an idea is a fool's self-fraud, so is sex when cut off from one's code of values.†
Chpt 2.4

platonic = loving, but not sexual
The woman of great spirit who admired you platonically, just for your genius, your mills and your Metal!†
Chpt 2.5 *

platonically = in a manner that is loving, but not sexual

Definitions:

(1) (platonic)
a loving relationship or feeling that does not have a sexual aspect
(2) (meaning too rare to warrant focus)