Some people like playing with fire.

Because she is married, so he’s sharing her too.

Easy dick.

It’s nice to just pounded and not deal with the other relationship crap that goes into a LTR/marriage.

Because men lie to them. They say they're divorced, in the process of getting a divorce, or he and his wife have an agreement, she's fine with it, yadayadayada and they believe it. It's really hard not to believe someone -- most people find it hard to spot a lie.