However, both male and female wrestlers are restricted to attack those of their own gender. Some tag teams of this kind are siblings (such as Cinthia Moreno and Oriental), trained simultaneously with the same instructor, or even are on a real-life relationship such as boyfriend/girlfriend (Cibernético and Estrellita) or, as an exceptional case, husband and wife (Billy Boy and Faby Apache). Lucha Underground has regular one-on-one matches between men and women, and Sexy Star held the Lucha Underground title for a day, after winning it in an elimination match and lost it to Johnny Mundo in an intergender match.[8]