What can you do for sexual dysfunction?

Depends: The interventions or therapies possible, depend on that the sexual dysfunction is -- there are many kinds. For instance, certain medications can cause some types of sexual dysfunction., but there are many others not necessarily related to medications. Your first step could be discussing your concerns with your primary care doctor, and going from there to find therapist, psychiatrist if needed.

Depends on what kind: It's not really possible to answer your question without knowing what kind of sexual dysfunction you mean. Here's a link that lists lots of resources: http://www.Kinseyinstitute.Org/resources/sexlinks.Html#health. You can also go here: http://www.Aasect.Org/ to locate a professional sex therapist or sexuality counselor.