It starts off as a simple bet. "I bet you can't get that hottie to go home with you." Then, it's, "I bet you can't get her to wear that toy out in public."
Ally doesn't know that the only reason her boyfriend is with her is because of a series of perverse bets that he has with his friends. Her ignorance doesn't last for long as the lies come out in the open when she finds him with another woman in his lap.
In a fit of rage, she grabs Alan, his co-worker, out to the back alley and lets him has his way with her. The sexy black man knows exactly how to touch her to make her come undone. Her boyfriend can only watch as the other man takes her, bareback and unprotected, and continue to watch on in horror as even more men join in.