Why? As Austin Powers once boldly declared, "It's a man, baby."
The 37-year-old Fox was born a man, and she underwent gender reassignment surgery in 2006 along with the supplemental hormonal therapy.
Fox's next bout, which was scheduled for Apr. 20 in the Championship Fighting Alliance semis, has been canceled, as the promotion wants to let the smoke clear.
"We stand 120,000 percent behind Fallon," CFA CEO Jorge De La Nova said. "She's a female. She's a very sweet girl. There's a lot of money on the line for her, and she's performed very well. We're going to give her a couple of weeks to see how this thing turns out."
The CFA may be supportive of Fox, but the rest of the women's MMA community isn't pleased with the 37-year-old.
Invicta FC champ Carla Esparza thinks it may be a safety risk for Fox to fight women, since she was born a male.
"I am very upset by this news, especially because one of my best friends, Ashlee Evans-Smith, is currently in an MMA tournament with this person," Esparza said. "Fallon Fox was born a man, and is now a post-op transgender woman. Fallon has blown through her first five opponents, the last one by 39-second KO. Knockouts are very rare for women. I have nothing against Fallon as a person, but I fear for my friend Ashlee's safety and any other females who have to face her. This is an absolutely unfair advantage."
Fox has been steamrolling over her opponents, with her most recent fight ending in brutal knockout fashion.