Very dirty book I could justify as an adolescent enquiring academically into the world of adults she is soon to enter. But I won't, it was just a very dirty book I felt I could buy from W H Smith's without 'looks' from the shop assistant.
This book was a waste of time. Though it's widely regarded as a definitive text and still used in college level human sexuality classes, I found it to be full of errors. For instance, it plainly states, based on experimental results in the laboratory, that men always have their orgasm before the woman. It never occurred to them that the artificial environment of a laboratory, or the fact that the men were having sex with the woman for the very first time, might be tainting their results (duh!)
There was another "experiment" that showed there was no limit to the number of orgasms that a woman may experience in a short period of time. They proved this by hooking a woman up the an EEG and having a whole host of guys come in, one at a time, and have sex with her. Again, there was no consideration that their results might be a little skewed and not representative of women as a whole. Indeed, what kind of woman would agree to such an arrangement? Not your average Jane, I would think.