Clinicians see patients who have a variety of sexual dysfunctions. A woman who has previously been molested or sexually assaulted may no longer be desirous of sex or may have difficulty with arousal. A man who has recently been widowed may experience difficulty achieving erections when he enters the dating scene. A woman with multiple sclerosis may no longer have orgasms. A man who is taking antihypertensive medication may have difficulty obtaining an erection. Recently postmenopausal women may find intercourse painful. Patients who are on antidepressants or antipsychotic medication may report impairment in their sexual functioning. It is important that clinicians be knowledgeable about human sexuality, the stages of sexual arousal, and sexual dysfunctions so that they can appropriately evaluate and provide treatment to their patients who present with sexual dysfunctions.