Good question! It made me challenge some of my assumptions.
Merriam Webster defines flirting as “to behave amorously without serious intent”. Flirting, at its core, is a less direct, less intense way of letting someone know you’re interested in them romantically and/or sexually.One can flirt with another person without it being reciprocal.
I made my previous comment as I used to dance and my ex is a dance instructor. Men attending dance lessons or going out to dance with solely amorous intent are the bane of many dance scenes.