I'm happily married - ten years this year - and would never cheat, or even consider cheating. Last summer, I bumped into a customer I knew from work who'd never seen the boys, not seen me for six years or so. We had a catch-up chat, not flirty at all. It was just nice to talk about my 'old' life before children, with someone who I'd known then, and I'd have been happy at that. As he drove off, he said with a twinkle. "You've still got a lovely arse." It may sound a bit crude, but I was really chuffed! It made me feel a little less like a mum, and a little more like me again.
I see no harm in it - I even told my husband!