How did they get taught all that, when they wouldn't talk about sexual things at all?<quoted text>
For what it's worth, there are many who *do* feel sex is dirty(particularly oral/anal sex and masturbation) and/or should mainly be had for procreation sake because of religious beliefs. I've seen people on these boards proclaim that. I may not agree with them but they're free to believe whatever they wish and live life as they see fit.
In *my* family, the women were taught that they must be pure yet it was ok if a man slept around. In fact, it was a given, and often encouraged, that a man sow his wild oats before he got married. Women were taught to believe that sex was dirty and something you had to put up with in order to keep your husband happy. I think that point of view was perpetuated throughout the years as a combination of religious beliefs and pure Mexican macho bullshit.
(remember, wouldn't even share about menses cause anything sexual was dirty?)