The latter point is well-represented in urban folklore, which abounds with tales of sexually naive adults who dont understand what sex is, have sex the wrong way, or dont grasp the rudiments of birth control. Thus we have tales of childless couples who discover their infertility is due to
either a complete lack of intercourse or to the husbands mistakenly penetrating his wifes urethra (because no one ever explained sex or proper sexual techniques to them), couples who use prophylactics by placing them on the ends of bananas or broomsticks (because thats how condom use was demonstrated to them), and women aghast at finding themselves pregnant even though theyve been consuming contraceptive jelly.
(In Joseph Hellers novel Catch-22, Doc Daneeka reminisces to Yossarian about his days in private practice, and he talks about a couple who once came to him because they were unable to conceive a child. Despite the couples claims of regular sex, the doctor discovered upon examination that the wife was still a virgin. He used plastic models to demonstrate to the couple how to have sex the correct way, and a few days later the husband returned and punched him in the face.)