I went on the pill at age 19, while away at college, both for BC and to help with awful cramps. My parents never discussed sex with me, but I was lucky enough that the sex ed program at school was very educational. They liked to scare us into not having sex by telling us what AIDS, herpes, etc. could do to you.
The most I ever heard about sex from my parents was, "I couldn't habdle it if one of them (me or my sister) got pregnant." Oh, and also, "I know you'll do the right thing." (Spoken by my dad when I was a senior in high school, going to spend the night at my best male friends house with a bunch of other people. The thought of having sex with any of them was revolting to me, but dad thought I thought otherwise.)
My dad also burst in on my sister while she was over at a friends house (who was a girl) because he was sure they had boys over and were having sex. They were not, and my sister was mortified!
Seven years later, I am married and still on the pill, as I'm still not ready for a baby. Though now, mom is!