Bicurious is a term for someone who is primarily monosexual (usually, heterosexual) and is curious or open to having relationships with genders other than that of their usual partners for any reason. It is commonly considered a state of exploring one's sexuality or questioning if one is bisexual.
The terms heteroflexible and homoflexible are sometimes applied to bicurious individuals, though some individuals distinguish between the concepts in that bicurious is a state of experimentation while hetero/homoflexibility are not.
Birocurious is a sub-term for someone who is primarily monoromantic (usually, heteroromantic) and is curious, open to, or interested in having romantic relationships with genders other than that of their usual partners for any reason. One can identify as bicurious and be open to biromantic relationships; however, if one wishes to specify that they are not interested in bisexual relationships but are interested in biromantic relationships, they may identify as birocurious.
The term bicurious started becoming popular after 1984, according to Merriam-Webster, but The New Partridge Dictionary of Slang and Unconventional English and Oxford Dictionaries’ Lexico claim that the term was coined in 1990.
The flag for bicurious was created by Tumblr user Arco-Pluris on July 5, 2018. Pink represents bicurious lesbians and gays, blue is for bicurious straights, and the white is for being unsure/questioning. The colors meaning are the same of the bisexual flag, pink represents homosexuals and blue heterosexuals. The flag has no purple in the middle as bicurious individuals are not necessarily bisexual. White is for doubting or questioning and light stripes is for slight feelings and shared experiences.
On May 16, 2021, FANDOM user Uncertified Funny designed two alternate bicurious flags. One is Arco-Pluris's flag with equally-sized stripes and the other is a five-striped version of the flag.