Sexual orientation is a social construct used to describe a pattern of emotional, romantic, and sexual attractions to men, women, both genders, or neither gender. It is easily distinguished from other components of sexuality including biological sex, gender identity, and the social gender role.
The reality is that homosexuality is not an illness. It does not require treatment and is not changeable. Gay, lesbian, and bisexual people may seek psychological help with the coming out process or for strategies to deal with prejudice, but most go into therapy for the same reasons and life issues that bring straight people to mental health professionals. (Zaakirah Rossier, Health24, March 2011)
Source: American Psychiatric Association