Multisexuality (also known as plurisexuality) is the term for attraction to more than one gender. As such, it is an umbrella term for bisexuality, polysexuality and pansexuality.[1]
While there are several designs for a flag representing multisexuality,[1] the only one currently known to be used has five horizontal stripes in pink, purple, yellow, green and blue, with the widths' ratio of 3:1:1:1:3.[1,2,3] The flag was originally published on 10 October 2015 without an explanation of its meaning,[2] but most likely, it is a combination of the flags representing bisexuality, polysexuality, and pansexuality as is evident from its design.[1] The only currently known example of its use is from Tel Aviv, Israel, where it was hoisted in Rothschild Boulevard together with many other sexual orientation flags in early June 2018,[3] possibly in honor of the Tel Aviv Pride, which traditionally takes place at that time every year. The fact that the reporter did not recognize it, as is evident from the file name of its photo,[3] reveals how rarely it has been used. Tomislav Todorović, 21 August 2021 Sources:
[1] Multisexuality at LGBTA Wiki: https://lgbta.wikia.org/wiki/Multisexual
[2] Multisexuality flag at Deviantart: https://www.deviantart.com/pride-flags/art/Multi-4-565261843
[3] Trip By Trip website: https://tripbytrip.org/2018/06/05/gay-tel-aviv-pinkwashing-or-genuine/
(image: https://tripbytriporg.files.wordpress.com/2018/06/telaviv_flag_unknown3.jpg)