I'm happily married but flirt shamelessly at work, especially with the 2 much young good looking lads and a fair few customers too ...
My husband flirts just as much at work too...
We both come home tell each other what we've said and done with the flirting as we don't hide anything from each other.
What we've said many time is...look and flirt but don't touch at the end of the day we're married not dead.
I've also taken a slight interest in other women, I've told my husband who now looks at who I look at and then smiles and nods if he likes what I see. I think its perfectly normal to look around and be interested in either gender.