I've read that too... sometimes it's a kind of subconscious revenge thing. Where, since it happened to them, they'll do it too. Also they see the OW who destroyed their marriage as having "more power" and end up replicating it... at a subconscious level that is.....
The other thing to be aware of is the effect on kids. For example, one thing I read is that sometimes women who get involved with married men have fathers who had affairs. They see mom as being weak and unattractive (not having husband's interest), while OW is the attractive one (that's who dad treats well and seems most interested in), and ends up being the "role model" of who they want to be since being loved, admired and attractive to men is so important to women -- particularly young women who are just trying on different roles. Very sad...
There is no arriving, ever. It is all a continual becoming.