[rayiner]

That's a really weird framing ("they warn their spouse that they are not first in line"). Lot's of married people with kids are "24/7." How many Chinese and Indian people come to America and spend 24/7 running a restaurant? Are they single? Or are they married with kids?

[manquer]

There is a strong social expectation to stay married. Many times the marriage itself is arranged by the families. It doesn't occur to some that splitting up is a possibility. Also they usually see it a combined venture of both the spouses.

The social bonds are so strong, I know plenty of marriages where the husband is living abroad usually middle East and comes home literally for few days in a year and the marriages still survive