A straight-back armchair: allows the hips and shoulders to be against the back of the chair while fully supporting the thighs.
Explanation:
Rheumatoid arthritis is a <em>chronic, autoimmune, inflammatory </em>disease in which symmetric involvement of multiple joints occurs. This can cause significant <u>physical limitations </u>and therefore a deterioration in the quality of life.
I know one is to get tested. Another could be to use protection that could prevent that kind of stuff. Then if you're already infected, you should tell your partner. And if you do sleep with your partner while infected, tell them to get tested.