Taken from Wikipedia
The first incel website, Alana’s Involuntary Celibacy Project, was gender-inclusive. There are present day women-specific incel forums, such as /r/Femcels, /r/TruFemcels, and /r/ForeverAloneWomen. Nonetheless, there is disagreement in online incel communities on whether women can be incels, with some claiming that male incels grossly outnumber female incels, others claiming that it is impossible for women to be an incel at all, others claiming that only women with a physical deformity can be incels, and others arguing that only unattractive women belonging to the “bottom percentile in terms of appearance” can be incels. According to the Anti-Defamation League, the majority of incels do not believe women can be incels (if that is not gender biased, I do not know what is). M. Kelly wrote for the Political Research Associates in 2021 that incels point to the existence of female incels as an argument against criticisms of the communities as misogynist, but that most incel communities don’t accept them and ban them from using their forums.
Tens of thousands of self-identifying female incels, also called “femcels”, are reported to populate the internet. As of February 2020, their most popular site was r/TruFemcels on Reddit, with over 22,000 members until it was banned for promoting hate. Journalists have written that outside of the female incels’ own communities, few believe women can genuinely experience involuntary celibacy. Some female incels believe they could have casual sex, but fear it would only be from men who would abuse or disrespect them.
Women who identify as incels share some similarities with their male counterparts, such as belief that physical appearance is the most important factor in finding a partner. In other ways they tend to be different; for example, according to journalist Isabelle Kohn, rather than being angry at the men who reject them, they empathize with the men for not wanting to date them. Kohn notes the tendency for female incels to turn their rage inwards, rather than outwards like males. Journalist Arwa Mahdawi hypothesizes that the fact female incels do not go on violent rampages like some male incels is the most obvious reason why female incels have not received much attention in mainstream media. In February 2020, Kohn wrote that she could find “mountains” of academic papers on male incels, but none on female incels. She says the assumption that female incels do not exist adds to their pain.