Most professional submissves are female. Here’s an excerpt from an entry by Axe where he tells of the woman who offered to pay him to be her slave:
I would be required to be available to her at all times. If she called me in the middle of something I would need to stop everything to leave and be available to her.
I would not have any limits and I would be required to wear a chastity device at all times.
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Wow! I would really love that arrengement. I would be happy to just be a male sex slave or sissy maid for a really strong female, let alone be paid for it!
Man, what a dream come true