Sexual relationship disorder is a disorder where a person has difficulties in forming or maintaining a sexual relationship because of their gender identity or sexual orientation. The World Health Organization lists sexual relationship disorder in the ICD-10, under "Psychological and behavioural disorders associated with sexual development and orientation". The WHO describes it thus: The gender identity or sexual orientation (heterosexual, homosexual, or bisexual) is responsible for difficulties in forming or maintaining a relationship with a sexual partner. (F66.2)