The Position Sex Bible is a position guide aimed at cis-gendered heterosexual couples who want to have PIV sex in a lot of interesting positions or possibly just add a few new positions to their repertoire. With 291 positions and techniques to try you'll have your hands full for a while, even if some of them are variants of the same position. There are even some spicier positions at the end if you want to add toys or maybe even a little light anal play.
Look, Layout, and Navigation:
I'll be frank, I have one major problem with this book, and it's that the author renamed the positions, so if you want to look up a certain position, good luck. Sometimes this renaming includes moving the name of one position onto a different position, and renaming the original. For instance, the lotus position has been renamed "The Body Hug" then the name "Lotus Position" has been applied to a completely different position.
On the other hand, the navigation of the book is broken down into convenient categories. If for example, you wanted to do it in a chair, you could turn to the "Chair Action" section. The sections include positions for in bed, the edge of the bed, from behind, standing up, in a chair, at the office and advanced positions. It also includes a section on oral and foreplay and a section on toys.
As for the layout, the pictures take up one and a half pages each meaning that the picture gets split and distorted by the center of the book. It can be hard to see the position being depicted as it's often the important parts that are located in the seam where they can't be seen. The actual description of the position gets the remaining half of a page and for the most part makes up for the distorted pictures.
The models in all of the pictures are the same couple. I admit I was a little disappointed, I'd hoped for either a nice diagram using sketches, or a little variety in the models for both aesthetic reasons and because I'd have liked to see different height combinations. The man in the pictures reminds me of a certain Vulcan from the starship Enterprise, so Trekkies, remember to get out your waterproof sheets. The woman looks like Uma Thurman's character from Pulp Fiction. Again the angle and positioning of the photography can make it a little difficult to see how the necessary bits should fit, but it isn't something that can't be figured out fairly easily. The photography doesn't come across as pornographic either if that is a concern.
The Positions, Descriptions, and Overall Effectiveness:
Most of the positions are well explained and should be possible for any couple of average mobility. Some of the positions would even be good for individuals with limited mobility. There are only a few positions that look like they might be dangerous for anyone who isn't a trained circus performer or an olympic athlete.
I've become convinced that two or three of the positions were conceived of while someone was exercising with their partner and said, "I wonder what this would be like if you put your dick in me." They were extremely similar to fairly common workout activities. We haven't tried them yet so we don't know if the supposed benefits are there, but they're unusual on paper.
The descriptions used give instructions and information on the position in three to four sentences. Unfortunately, this structure didn't work out so well for their "techniques". One of the pages is dedicated to something called the "Mare's Trick" but I moved on to the next page knowing only that the Mare's Trick is a technique performed in the cowgirl position that allows her to hold the man's penis in her vagina by pressing her legs together. There is no explanation of how this is to be achieved while straddling his thigh. Tightening the thighs around his hips and waist does nothing to affect the "tightness" of the vagina as far as I can tell. It doesn't really do much more than leave hip-bone shaped bruises on the insides of your thighs. Basically, I shouldn't have to google techniques listed in a book.
Overall, I feel like this book is simplistic, but effective. The variations mean that just about any height combination can manage most of the positions and find the right angle for their anatomy. I also like the organization and most of the design choices. I do not like the renaming of positions, the techniques or the positioning of the photos.
I think the book could be improved by adding diagrams better detailing the positions and the proper movements in said positions, repositioning the photography and adding more detailed instructions for techniques.