I am slightly bow-legged. How does this affect the rest of my body?

Depending on how -- Much of the bowleggedness you have. If its slight then it may not have any effect on the rest of your body. Also depends on the cause of it: if its due to arthritis or as a result of an injury, then it might increase, resulting in affecting the other joints. Best thing for you is to be seen by an orthopod to determine the cause of your problem and hopefully treatment would be started. Good luck.