No, I do not think discussing sex encourages kids to participate. Originally Posted by gentlemantooGod took care of that "encouragement" and made it "normal"!
I've heard some rather strange attitudes expressed. I recall one outstandingly attractive lady who believed that intercourse was not acceptable according to the teachings of the Bible, but that the Biblical instructions did not forbid her performing oral sex on me or me on her. She was excellent at God's work and felt the importance of expressing herself in a manner acceptable to God. I felt obligated to allow her to follow God's word (or lack thereof).