Welcome to your 21st birthday challenge, male.
If you can defeat me, you will win your freedom.
If you cannot, you will be injected with chastity nanites which will give me absolute control over your sexuality. With just a thought, I will be able to tease you to the edge of orgasm and keep you there for weeks. Whether you ever come again will be my decision. You will serve as my faithful sex toy and I will make you suffer for every second of it.
To avoid this fate, enter the ring and try your best. You're an ordinary human male and I - like all women - am genetically-engineered to be hundreds of times stronger, tougher, and faster. I will beat you to within an inch of your life.
It's not fair. You don't stand a chance. But you have no choice.