I've told it before, but here goes...
My g/f was my best friend for a couple years. She was married and didn't cheat and I never considered her an option so we used to talk about a lot, including my colorful sexual background. When she left her husband (a complete surprise) we got together almost immediately. I had always thought she was a little "prudish", until she made a comment early on that "It's to bad you don't have a headboard to tie me to" That was 3 years ago. We live together now and I just finished construction on a nice little attic dungeon. It's been a blast and I wouldn't even consider a vanilla relationship again.