Where? This is not my experience in the EU. The "whole family" here seems quite hands off and liberal with what their adult kids are doing with their genitals, as in whether they decide to have kids or not and with who they're having them.
"USA" on its own seems like a poor answer. USA is very diverse. There's anything from strict religios communities who have a tonne of babies, to modern families which exclude having kids altogether as a lifestyle choice.
