Yes, I have heard of this phrase before. "married, but available"....also sneaky and suspicious. I would avoid married, but available women or men for that matter.  It's a web that you wouldn't want to get tangled in. Once you get trapped it would be hard to escape. Plus, women or men don't like cheating spouses. 

The way to identify one when you meet/chat is that they are usually too obvious. They are looking for attention! You can usually tell if somebody is with someone already! The number one sign is if they look suspicious and sneaky like their trying to fool around. My advice don't get suckered or fooled by MBA's.

Why would you set out in the first place to find a married women/man if you work with someone or are freinds and they are married and something clicks between the two of you thats different but still not really right but acceptable,if you follow this path hope you meet the wrong person you sholdnt f..k with Spouse who learns you a lesson in life

chineselovelinks.com  i actually met one from there look for married women also separated women

so you want the snatch and have someone else buy the house and car and you live in the house parttime and borrow the car.  what a deal, best part is when the house falls apart or the car breaks , some other poor bloke pays the bill.

MBA is based on LUST.  Never a stable acceptable notion.  Both parties always end up losing in the end.  However, I understand its a big thing here for Chinese men in their 40s since they married so young.  Again its a lose-lose game.