Catmandu, it looks like you're referring to my post...I'm not as much younger than you as you might think. I'll explain. My mother was of the "free love" generation and was very open with me about a lot of things, including sex. Although she didn't go into all the details with me, there is no doubt in my mind, let's just say that. My grandmother was of the WWII generation but had a bad habit of drinking too much bourbon on occasion and spilling details about her sex life. Although it was only a very few ocassions, they stuck in my memory because, you know, it was my grandmother.
As for social background, my mother's side of the family was Irish Catholic, which is fairly repressive.