When you train in the craft of BDSM--you explore each fetish that turns you on. A Master or Mistress helps you extract maximum pleasure from the fetish.
A TRUE Dominatrix will go either way--she must to round out her training. All the most common fetishes are explored
IF she progresses to Mistress she then has the experience to train either sex and pass on the knowledge she attained through HER training.
I have trained several over the years and it's a lifestyle that has many rewards---both financially and emotionally.