The American Psychological Association states that "sexual orientation" "describes the pattern of sexual attraction, behavior and identity e.g. homosexual (aka gay, lesbian), bisexual and heterosexual (aka straight). ... Sexual attraction, behavior and identity may be incongruent. For example, sexual attraction and/or behavior may not necessarily be consistent with identity. Some individuals may identify themselves as homosexual or bisexual without having had any sexual experience. Others have had homosexual experiences but do not consider themselves to be gay, lesbian, or bisexual. Further, sexual orientation falls along a continuum. In other words, someone does not have to be exclusively homosexual or heterosexual, but can feel varying degrees of both. Sexual orientation develops across a person's lifetime-different people realize at different points in their lives that they are heterosexual, bisexual or homosexual."

According to Rosario, Schrimshaw, Hunter, Braun (2006), "the development of a lesbian, gay, or bisexual (LGB) sexual identity is a complex and often difficult process. Unlike members of other minority groups (e.g., ethnic and racial minorities), most LGB individuals are not raised in a community of similar others from whom they learn about their identity and who reinforce and support that identity. Rather, LGB individuals are often raised in communities that are either ignorant of or openly hostile toward homosexuality."

The British gay rights activist Peter Tatchell has argued that the term "gay" is merely a cultural expression which reflects the current status of homosexuality within a given society, and claiming that "Queer, gay, homosexual ... in the long view, they are all just temporary identities. One day, we will not need them at all."

If a person engages in same-sex sexual encounters but does not self-identify as gay, terms such as 'closeted', 'discreet', or 'bi-curious' may be applied. Conversely, a person may identify as gay without engaging in homosexual sex. Possible choices include identifying as gay socially while choosing to be celibate or while anticipating a first homosexual experience. Further, a bisexual person can also identify as "gay" but others might consider "gay" and "bisexual" to be mutually exclusive. There are some who are drawn to the same-sex, and may not have sex, and also not identify as gay; these could have the term 'asexual' applied, even though an 'asexual' generally can mean no attraction, and includes heterosexual attraction that is not sufficient to engage in sex, or where the sex act is not desirable, even though titillation may occur.

Sexual orientation, identity, behaviour
Homosexuality
Sexualization
Usage in other language