This document discusses sexual dysfunction and normal sexuality. It begins by defining normal sexuality and outlining the four phases of the physiological sexual response cycle: desire, excitement, orgasm, and resolution. It then defines sexual dysfunction and outlines its classification according to the DSM-5, including desire, arousal, orgasm, sexual pain disorders, and those due to medical conditions. Specific disorders like male hypoactive sexual desire disorder and female sexual interest/arousal disorder are then discussed in more detail such as their criteria, contributing factors, risk factors, and treatment options involving somatic and psychosocial approaches.