I do not know why this is even news, since it's been a thing as long as humans have existed. Married Dating: The New Dating Trend.
Extramarital affairs have tradtionally been normal among the social class extremes: the wealthy and aristocratic, and the poor. An interesting sociological topic might be why so many ordinary people do not see this as a good idea.
The cited motives listed are these:
Top Reasons for Men:
His wife’s libido has dropped after marriage, children, etc.
His wife is more preoccupied with being a mother than a partner.
His wife no longer makes him feel sexy, masculine, virile.
He is nostalgic for his free and wild youth
The relationship is dull. Same conversation over and over again, same position over and over again, etc.
Top Reasons for Women:
Her husband no longer makes her feel sexy/desirable.
Wants to explore sexual desires (kinks) she was too immature or unaware of in her youth.
Her husband views her as a caregiver not a sexual being.
Her husband initiates sex like she is a robot. No slow burn. No romance.
No passion, excitement, thrill.
Ho hum.