Intercourse has to be pleasurable rather than painful. Vaginal soreness is a common concept and it is wise to use lubes to make things smooth, especially when the sack session is going to last multiple times.

how to give a woman multiple orgasms - Get creative

Try out new positions and let the experimentation keep the boat floating. Once you are done with clitoral stroking, try out the positions (like reverse cowgirl and doggie style) that stimulate the G-spot. This moan zone can make you go gaga when stroked and works like a magical charm to achieve multiple orgasms.
how to get a girl to multiple orgasm - Be yourself
This is really important, girls! There is no need to be self-conscious and make it clear in your mind that sex is equally for your own pleasure. Demand what you like and say no when you are not willing for anything. If you feel like, don't be hesitant to take the lead, neither be shy to tell him what you want.
How to make a girl multiple orgasm - Appreciation
Appreciation at the right time is the key to stay aroused and is needed from both the partners. Tell each other how they make you go crazy and how special you are in their life. It will keep the waves of love and passion hitting the shore.