my definition: any gesture towards her thats not in the normal repertoire.
I've made special breakfasts after she's had a long couple of days(in our case thats just a boozy one, be it cider or mimosa's)
took her to venues i know she'd like (book market, or some chick flick
some small gestures like putting a flower in her hair on an unguarded moment, or stealing a kiss.
As for the rational thinkers, sometimes living a little fantasy can do wonders for the mind