Ride 'Em Cowgirl Book by Dr. Sadie Allison Dr. Sadie Allison gives couples the lowdown on everything and anything positional. Illustrated, educational and sexy. Covering anatomy, do's and don'ts, missionary, doggystyle, and girl on top variations, specialized positional devices, and even sex during pregnancy. Also features sections on prostate play and positions for bigger women. Presented in an easy to read format, with bulleted lists so you can get down and dirty that much faster.