My wife and I were married straight out of college. At the time I knew she suffered from a potentially debilitating mental disorder, so I came into the relationship with my eyes fully open. Since then, nine years and two children have followed. About two years ago her disorder began to get worse. Suicidal ideation, hallucinations, delusions, and the like. Her psychiatrist put her on a new medication that for the most part has eliminated her symptoms. She has gotten her life under control and is doing much better. But here’s my problem, and I feel extremely selfish for this: One of the side effects of the medication is a complete loss of interest in sex. She is still loving and affectionate, but her libido is nonexistent. We have discussed this many times, and argued about it. Over the past six months we have reached a tacit...