There is one small % of possibility that leads to this scenario. It is the major city's work life culture. If you are the lower pyramid of the workforce of the major cities, you will likely ended up in such condition. These are the reasons :-

1) both husband & wife need to work, reach home already very tiring.
2) work long hours for survival & commitments. Works & pay cheques >> living. Weekdays, go work before see sun rise sunlight, comes back after sun already set. Sometimes, weekend also works.
3) With the survival priority >> livings, sex will not be priority. Coz sex = responsibility especially for certain married pair. Birth control = additional cost, no birth control, additional baby = additional burden to financial.

An example of this will be the Japanese & S.Korea's society. Our society may be going through the same cycle. The Mother nature have ways to control the population, by making living hard, living thing will stop to multiply. It could be the act of the nature in the end.

Sex toys sales affected by economic downturn. Need to do more marketing, kek. The way the marketer can exploit the scenarios( be it real or hypothetical cases) is really mind blowing.