Sexual problems can be extremely frustrating, not only because they put a damper on your sex life, but also because they can seriously affect your relationships. Fortunately, plenty of research is being done on the subject, most recently by the Institute for Family and Sexuality Studies in Belgium. A new study, published in The Journal of Sexual Medicine, looked at how age correlates to different types of sexual dysfunction, including a lack of sexual desire, a lack of sexual arousal, difficulty or inability reaching orgasm, and pain during sex.