My mother told me about my menstruation cycle... That was very odd [for her, that is].
My father told me to think carefully before you have sex with a man, he told me to always say to myself "Will I really be able to look at this face for the rest of my life?" It worked, too.
Other than that, they never really told me anything, but I think that just like breathing, what you're supposed to do for reproduction is also instinctual.