Short answers, pulled from the story.
The term bisexuality was coined in the 19th century by a physician named Charles Gilbert Chaddock. This occurred decades after zoologist Alfred Kinsey revealed in 1948 that nearly half of all men had engaged in both heterosexual and homosexual activities during their adult lives.
Research indicates that the INAH 3 nucleus of the anterior hypothalamus in bisexual men studied in 1991 had a size similar to heterosexual men. Studies also suggest that exposure to high levels of testosterone and low levels of estrogen during fetal development may be associated with bisexuality, alongside a statistically significant 2D:4D digit ratio.
The first documented appearance of bisexual characters in American film occurred in 1914 with the movie A Florida Enchantment. Censorship under the Hays Code from 1934 to 1968 effectively erased such representations from mainstream cinema until the late 20th century.
Rock musician David Bowie famously declared himself bisexual in an interview with Melody Maker in January 1972. He later described this declaration as the biggest mistake he ever made due to the puritanical nature of America hindering his career.
The bisexual flag was designed by Michael Page in 1998 and features pink, purple, and blue stripes. These colors represent homosexuality, heterosexuality, and bisexuality respectively to symbolize unity and pride for the community.
Celebrate Bisexuality Day is observed annually on September 23 to recognize and celebrate bisexual people and the history of bisexuality. This event acknowledges the distinct bisexual community that formed due to the invisibility of bisexual individuals in society.