Don't do it bro. You never know who she is married to, or what he does, or did for a living.
Case in point my wife. Very beautifull woman, but no guy will go near her for fear of Who she is married to and how he used to earn a living!! For example if a man decided to partake in a night of love making with my ...i mean some one's wife, he would probably wake up in the middle of the night in some abandoned mill building some where in the North east coast. And be staring at a gas powered chainsaw sitting on a table in the middle of the room. He is of course chained to a steam pipe overhead and his legs are chained to four cinder blocks ( two to each leg works best, just enough to keep the legs from moving and helps weigh the bodybag down in the ocean) Then some clearly upset husband would probably start by taking little chunks out of his calves first then working up the body until he got to his obliques then started to slowly press the saw into his adulterating sides until he was sucessfully now two people.
Now I know what you might be thinking, Well what happened to your..ah...this guys wife. Well lets just say that just like my wife, this guys wife is now leaving him and taking everything he has. Now if you thought that this guy was mad before then you have not seen him after he looses his 65 inch Mitsubishi high def t.v and his Bose surround sound.
Anyway bro just some food for thought, Just do me a favor and the next time she flirts with you just think of this little story and ask your self " Is it worth it? " Im sure you will make the right decision and every one lives another day!