MedlinePlus Medical Encyclopedia: Sexual Problems Overview. Sexuality and Information Council of the United States: Fact Sheet on Sexuality in Middle and Later Life. "The Too Fast Lane," MedicineNet.com. "Impotence: Signs and Symptoms Index," Medicine.com. "Erectile Dysfunction," Medicinenet.com. "Sexual Dysfunction in Women: What Can I Do If Sex Isn't Working For Me?" FamilyDoctor.org. WebMD Reference in collaboration with The Cleveland Clinic: "Sexual Health: Vaginal Infections." Priapism, The Cleveland Clinic web site. "Curvature of the Penis," Medline Plus web site. "Penis Pain", Medline Plus.org Medical Encyclopedia. Sexual Pain Disorder, MedicineNet.com. WebMD Reference in collaboration with The Cleveland Clinic: "Sexual Health: Female Pain During Sex." WebMD Feature: "A Woman's Guide to Revving Sex Drive." "Drugs That May Cause Impotence," MedlinePlus.org. WebMD Medical News: "Orgasm Can Bring Headache." WebMD Medical News: "Headaches After Sex." Retrograde Ejaculation, Medical Encyclopedia, MedlinePlus.org.