(And, for however much of this effect is accidental, there are also parts of it which are maintained consciously/intentionally by the population and cultural institutions. Consider, for example, the Japanese public's idealized view of musical-performer "idols" as being "pure" [i.e. never being in romantic relationships.] This isn't just a mistaken idealized assumption that garners disappointment when corrected by reality; it garners actual backlash toward idols violating the assumption, often so widespread and vicious that the performers are effectively forced out of the industry. Which has caused the idols' production companies to effectively require their talent stays single [or at least hides their relationships from the public] — making what was originally a mistaken idealized assumption into a social-norm-enforced truth.)