There are a number of books out there on the Karma Sutra. I myself have a wide collection of books dealing with sex and sexual positions. One of my favorites is a book written by Nik Douglas, the author of Sexual Secrets. In this book he explains a number of techniques and sexual positions that have personally helped me in my sexual encounters. One of them is called the Yab-Yum. Loosely translated, the Yab means father and the Yum means mother. It is the Indian version of yin-yang. It is more of a mental or spiritual position meaning that both you and your partner are equals and what you and your partner are doing is a beautiful thing.
The Yab–Yum is a very close and intimate position. It starts with the male sitting down on the ground firmly with his legs crossed while the female sits on top of him with her legs wrapping around her back and her feet crossing just behind his behind. This promotes a closeness with your partner as she can move very easily on top of you giving her more control while hold her partner in her arms. You and your partner not hold each other only for support but it keeps the heart centered and is a very good position for the spine.
The upright position versus horizontal makes for easier thrusting and rocking to and fro while the women’s g-spot gets stimulated more easily. This gives her a heightened sexual experience and sex she will not forget very easily. This position also helps to keep the male from thrusting to deep into the female which can sometimes cause discomfort for the female.
A good variation to this position is if the male sits on the edge of the bed or perhaps on a chair while the female then sits on top of him once again. This helps if either the women is slightly larger than the male or if you have a bad posture or lower back problems and is also easier on the legs.
Then for those who are more limber the female could try leaning backwards towards the floor which creates more friction helps both you and your partner to climax faster. If you need more friction both you and your partner could try leaning backwards. This takes a lot of practice and you need to be very limber.
This is just one of the positions in the many books available but all of them promote a healthier sex life and intimacy between you and your partner.