You're asking parents if they just skipped that page, back in the early 70's when I was junior high school age the Sunday Washtowel study was all about oral sex, I always say the first time I've ever heard of oral sex was at the Kingdom Hall.
How about all the little kids sitting there, then later on at home when they usually ask the kids what did you learn today at the meeting today, can you imagine being around that dinner table? Especially around those precocious five and six year old kids that every Cong usually has, can you imagine the questions? THe Borg had no shame discussing that for a whole hour, but god forbid you should see an R-rated movie or engage in sex before marriage.