You read about the porn challenge on a porn site. It involves passing 5 sexual challenges of all kinds. The prize for whoever completes it is $10000. Without thinking much about it you click the sign up button.
As soon as you click on the button a message appears on your screen Welcome to the Porn challange. Please provide us with your name, age, gender and sexual preference so that we can organise your first task. When you have finished click Continue to receive your first instructions.

It's simply a matter of completing 5 completely random sexual tasks that will be given to you to win a cash prize. There are no limits. All partecipants are 18+ yeas old