Answer:
Female dominance (or Femdom) refers to the BDSM relationships or BDSM scenes where the dominant partner is female. Oftentimes a dominant woman may is called a domme femdomme, domina, dominatrix, or simply dom. A female dominant in a master/slave relationship is often called the mistress.
Femdom fetishes are those where the female controls the activities to a large degree. Activities can include strap-on dildo penetration (also known as pegging), in which the dominant partner performs anal sex on the submissive partner, facesitting or smothering, which both tend to focus on the submissive partner giving the dominant partner cunnilingus, or in some instances "forced" feminization of a male partner.
The causes of femdom are many and including - adolescent curiosity or a random association between the object and feelings of sexual pleasure, reinforcement of this sexual association, lack of maternal affections, or even just the feeling of not being in control. A person with a fetish may not be able to pinpoint exactly when his or her fetish began. In unfortunate situations, a fetish may be related to activities associated with sexual abuse.