My brothers know, or at least one knows and the other has an idea. My oldest brother's then-gf gave him the Joy of Sex deluxe version for Christmas and the three of us (my brothers and myself) were sitting around talking about it. I was flipping through it and made a wise-ass remark about something in there and my oldest brother was like, "You couldn't even imagine what my g/f and I do in bed." My response was, "I bet I can, and then some. You don't even know what I'm into." His response: "You don't even know what I'm into." And my second brother was sitting there, his head switching back and forth between us. It's still pretty funny to this day.

And my mom found my copy of "Different Loving" when I was 16... that was hard to explain...