Lubricant and Menstruation: The Slipperiness of Sexual Knowledge

When I answer a sex question I am usually drawing on three sources of knowledge. I always start with research. It's not that I think scientific research delivers the best, the most accurate, or the most interesting answers. It's just a habit from my academic training. I want to start by learning what a carefully designed, methodical study by scientists and other academics might tell us about the question being asked.

Next, I turn to my professional experience. I've had the pleasure and privil...