Good, but....
The app is informative and well illustrated. Unfortunately the written instructions contained within each section are incredibly poor and require major revision in order to become cogent. With some work this app could be worth the $0.99 that the programmer is asking for it but at this point it only comes across as rushed and unprofessional. Perhaps an updated fix might warrant a better rating.
Anklebites about
400+ A Best Sex Positions HD & 365 Sex Calendar, v1.3