Zephyrus and Hyacinthus
Attic red-figure cup from Tarquinia, 480 BC (Boston Museum of Fine Arts)
The Flirtation (1904), by Eugene de Blaas
The bisexual pride flag
Burning of two homosexuals (the knight Richard von Hohenburg and his squire Anton Mätzler) at the stake outside Zürich, 1482 (from the Spiezer Schilling chronicle)
The overlapping triangles
Dance to the Berdache
Sac and Fox Nation ceremonial dance to celebrate the two-spirit person. George Catlin (1796–1872); Smithsonian Institution, Washington, D.C.
The double moon
A woman spying on a pair of male lovers. China, Qing Dynasty.
Venus flanked by Venus and Mars symbols for a bisexual woman
Female youths are depicted surrounding Sappho in this painting of Lafond "Sappho sings for Homer", 1824.
Mars flanked by Venus and Mars symbols for a bisexual man
Sappho reading to her companions on an Attic vase of c. 435 BC
Shudo (Japanese pederasty): a young male entertains an older male lover, covering his eyes while surreptitiously kissing a female servant.
Photograph of the Finnish artist Touko Laaksonen (1920–1991) alias Tom of Finland, well known for his stylized highly masculinized homoerotic art, playing the piano in late 1950s. In the background, his partner Veli Mäkinen (left) and his sister Kaija (right).
Young man and adolescent engaging in intercrural sex, fragment of a black-figure Attic cup, 550 BC–525 BC, Louvre
An illustration from the 19th-century book Sawaqub al-Manaquib depicting homosexual anal sex with a wine boy
Angelina Jolie is an openly bisexual American actress.
Shah Abbas I of Persia with a boy. By Muhammad Qasim (1627).
U.S. President Barack Obama signs into law the Don't Ask, Don't Tell Repeal Act of 2010
LGBT activists at Cologne Pride in 2015 carrying a banner with the flags of 70 countries where homosexuality is illegal
Protests in New York City against Uganda's Anti-Homosexuality Bill.
Roy and Silo, two New York Central Park Zoo male chinstrap penguins similar to those pictured, became internationally known when they coupled and later were given an egg that needed hatching and care, which they successfully provided.
Blood donation policies for men who have sex with men
–Men who have sex with men may donate blood; No deferral
–Men who have sex with men may donate blood; Temporary deferral
–Men who have sex with men may not donate blood; Permanent deferral
–No Data
Original Rainbow Pride Flag in San Francisco, designed by Gilbert Baker in 1978

Homosexuality is romantic attraction, sexual attraction, or sexual behavior between members of the same sex or gender.

- Homosexuality

Bisexuality is romantic attraction, sexual attraction, or sexual behavior toward both males and females, or to more than one gender.

- Bisexuality

The term bisexuality is mainly used in the context of human attraction to denote romantic or sexual feelings toward both men and women, and the concept is one of the three main classifications of sexual orientation along with heterosexuality and homosexuality, all of which exist on the heterosexual–homosexual continuum.

- Bisexuality

Along with bisexuality and heterosexuality, homosexuality is one of the three main categories of sexual orientation within the heterosexual–homosexual continuum.

- Homosexuality

For example, a gay or lesbian person would typically find a person of the same sex to be more attractive than one of the other sex.

- Sexual attraction

A bisexual person would find either sex to be attractive.

- Sexual attraction
Zephyrus and Hyacinthus
Attic red-figure cup from Tarquinia, 480 BC (Boston Museum of Fine Arts)

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Ladyboys in Thailand

Sexual orientation

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Ladyboys in Thailand
Gay Pride, Paris 2009

Sexual orientation is an enduring pattern of romantic or sexual attraction (or a combination of these) to persons of the opposite sex or gender, the same sex or gender, or to both sexes or more than one gender.

These attractions are generally subsumed under heterosexuality, homosexuality, and bisexuality, while asexuality (the lack of sexual attraction to others) is sometimes identified as the fourth category.