Sex therapy is a strategy for the improvement of sexual function and treatment of sexual dysfunction. This includes sexual dysfunctions such as premature ejaculation or delayed ejaculation, erectile dysfunction, lack of sexual interest or arousal, and painful sex (vaginismus and dyspareunia), as well as dealing with problems imposed by atypical sexual interests (paraphilias), gender dysphoria and being transgender, highly overactive libido or hypersexuality, a lack of sexual confidence, recovering from sexual abuse such as rape or sexual assault, and sexual issues related to aging, illness, or disability. Practice Modern sex therapy often integrates psychotherapeutic techniques and medical ones, such as Viagra (sildenafil) and Cialis (tadalafil) to increase erectile response and Paxil (paroxetine) to treat premature ejaculation. Sex therapists assist those experiencing problems in overcoming them, in doing so possibly regaining an active sex life. The transformative approach to sex therapy aims to understand the psychological, biological, pharmacological, relational, and contextual aspects of sexual problems. Sex therapy requires rigorous evaluation that includes a medical and psychological examination. The reason is that sexual dysfunction may have a somatic base or a psychogenic basis. A clear example is erectile dysfunction (sometimes still called "impotence"), whose causes may include circulatory problems and performance anxiety. Sex therapy is frequently short term, with duration depending on the causes for therapy. Sex therapy can be provided by licensed psychologists or physicians, who have undergone training and become certified. These trainings and certifications usually begin with a master's degree, and internship, and a license. This can take up to 2 years, and longer if a doctorates degree is desired. Sex therapy is distinct from sex surrogates. Whereas sex therapists discuss and instruct clients in sex-based exercises to be performed at home between sessions, sexual surrogates participate in the exercises with their clients as part of helping them to practice and develop improved skills. Therapists and surrogates sometimes collaborate on cases. Certified sex therapists do not have sexual contact with their clients. Symptoms Sex therapy sessions are focused on the individual's symptoms rather than on underlying psychodynamic conflicts. The sexual dysfunctions which may be addressed by sex therapy include non-consummation, premature ejaculation, erectile dysfunction, low libido, unwanted sexual fetishes, sexual addiction, painful sex, or a lack of sexual confidence, assisting people who are recovering from sexual assault, problems commonly caused by stress, tiredness, and other environmental and relationship factors. Sex therapy can either be on an individual basis or