Any herbal medicine is available for increase sexual power which dont have side effects?

saw palemetto

Horny Goat Weed is used in traditional Chinese medicine, and is native to China. Hundreds of years ago, a goat herder noticed incessant sexual behavior in his goats. He observed the goats and noticed whenever they ate certain weeds, the goats promiscuous behavior became even more noticeable - hence, Horny Goat Weed.
Horny Goat Weed is also called Ying Yang Huo in Chinese, and has been used to treat kidney, joint, liver, and back disorders, and it's also used as an aphrodisiac. Horny goat has testosterone like effects, stimulating sexual activity, desire, increases sperm production, and stimulates sensory nerves.

There are no documented, undesirable Horny Goat Weed side effects. In the study mentioned above, no side effects were noticed in any of the participants. However, many positive side effects (or benefits) were noted:
鈥he men noted overall increase in satisfaction with their sex life
鈥he men reported a increase in desire to engage in sexual activity
鈥ome men also reported a increase in their partner's satisfaction - presumably from their improved performance

Try "tongkat ali" is something from Malaysia... they make into drink which add with tea or coffee... no side effect...

Dates,Onion,Betle leave,Betle nut,Peanut,Almonds will do the trick according to Tamil Sex Books.

isaac_ leibnitz s answer is a very good answer it can help you good luck.