Arthritis in the hip, knee, leg, or arm can cause considerable pain during sexual activity. Experiment with different coital positions which put less strain on painful joints, and let your partner do most of the work if movement causes you pain. Consider what you do to be most comfortable lying in bed and start from there to find a position which could be adapted for greater comfort and mutual pleasure.
Adapted from an Arthritis Foundation brochure, the following descriptions may give you new ideas or starting points from which to find new positions to enjoy. Be sure to work together to find something comfortable and satisfying for both partners. Caution: If you have problems in your neck, Dr. Mark Borigini warns that you should not place a pillow under your head during sex.
Read this post in its entirety:
RA and Sexual Independence, Part Two