You mean there is a correlation between having sex and having babies?
I read about this in the Japanese papers because my b/f is Japanese (older hhehe) and it is shocking really that in a survey of college students the virginity rate among women has skyrocketed from 38% 6 years ago to over 53 today. Blaming social media and fear of pregnancy which are contributors no doubt but the major reason is the disestablishment of marriage. It’s hard to say if this is a sign of a permanent change in thinking or if the “youngsters” are still just having too much fun to settle down but they need foreign workers to take citizenship before the depopulation bomb literally sets off the Wreck Welfare State.