I'm guilty of knowingly playing with a married man. He was a FB for 2 years. I liked that I could keep him at arms length, knowing he wouldn't want a relationship with me. It worked. However, we were 99% soft swing, not that saying that makes any differences.
I know avoid married men or those with partners, mainly because you can't wear your fave perfume, or they have restricted times which limits meet opportunities. You can't leave any marks, no finger nail scratches or nibble marks etc etc.
If I'm in a club, especially in a couples room and it's a free for all soft swing orgy, I don't know who's married or not. It's not until afterwards and we chat/swap profile names, that you read the couple you've met are "FBs" and each have a different partner at home, but they look so loved up.
I've also played with several "single" ladies and it's not until we've had further meets and got to know each other, that they have confessed to having a hubby at home who haven't got a clue!
Only time I've felt real guilt like the lady in the blog, was when I met a guy in a hotel and he couldn't perform, so confessed to being married only for 6 months.