Sexual disorders can take many forms and have various underlying causes. They are broadly classified into four categories: gender identity disorders, paraphilias, psychopathological disorders of sexual development/maturation, and sexual dysfunctions. Common types of sexual disorders include lack of sexual desire, difficulties achieving or maintaining arousal/erection, premature ejaculation, and pain during sex. Factors contributing to sexual disorders can be physical, psychological, or social in nature. Treatment depends on the specific disorder but may involve counseling, therapy, or medication.