Different perspective here, the three women that I've known through my life who had affairs with men with young children all had a similar pattern. I have to stress this isn't all women yadda yadda but this is what I observed.
The man had come on strong to them and told them yarns about their wives - usually involving feeling neglected and lonely.
The women (that I knew) were all fairly attractive and single, often having come out of bad relationships (in two cases with there was domestic violence) so their self esteem had been knocked to the point where their relationship with themselves was now non-existent, I used to think that the reason they were hooked on these unavailable men was that they thought this was as good as it gets (in other words, that they were now cynical about men.)
The married man was implying that if it wasn't for him being such a good guy for staying with his wife because of the kids, he would be with the OW.
The OW repeated this like a mantra. I hear variations of:
"He's stuck in his situation"
"He can't leave because..."
"It's bad timing."
"They are platonic"
"He's waiting until the kids are older."
So a lie is spun by the man that these particular women knitted into a reality.
Again my observations are about these three particular women who I've known at different times in my life over the last thirty years so I'm generalising to what I observed.
In all cases the OW was unhappy. Lonely and unhappy. The dance of "pick me" was corrosive to them and their low self esteem and anxiety levels were obvious. Their cynicism about men was compounded by the reality of their experiences with these unfaithful husbands. One actually said to me "This is all that is out there."
In two cases the women were actually ex girlfriends of the men from their distant past. They had reconnected on Facebook (or in one case Friends Reunited - remember that?!) so for those two women there was a familiarity to the man which meant that they swallowed the lies faster with less discernment I suspect.
I've never met an OW who described the affair as fun. In the three cases I know of, all of them were miserable, spending an extraordinary amount of time waiting. Waiting for nothing.