There are multiple economical reasons for why this is. After WW1, the population became predominantly female & then shortly after WW2, the population was in an extreme ratio where women outnumbered men by over 20M. Women wanting a husband / child would then have to “compete” with the women around them rather than the traditional man courtship. In Russia, the women are also taught this because after the USSR was dismantled in 1991 & women started to work more in “men’s fields”, they needed to be