I just wanted to post an addendum to my last comment above.
This thread got me thinking quite a bit and I'm not sure where I strike my peg on it.
Nevertheless, what people I think should be aware of are the differences in long term relationships built up by years of compromise, fun, tears, joy, sorrow, laughter, fights, reconcilliations, children, deaths, marriages etcetera.
and
Short term attractions that are as elusive as wisps of cloud floating buy on a breeze.
The problem with flirting, especially that flirting that is done face to face (ie in the same physical space as opposed to remote flirting say by electronic means in a different space and time) is that the human body, though tempered by years of morality and ethical boundaries, is still prone to instinctive acts of sexual combustion; leading to acts of gratifying short term pleasure but resulting in something akin to post traumatic stress disorder - years of regret, fear, worry, avoidance.
I am of course referring to flirting where one flirtee(?)

is in a stable, happy relationship.
Distant fields always look greener, but opportunity lies right where you are. Robert Collier