If you haven't figured it out, the entire point of the challenge is for women to pose topless, squeezing a can or bottle of Coke between their breasts and take a picture or show off in a short video.
In 1986, several women in Rochester, NY were arrested and convicted for picnicking topless in public. Since then, passionate women have been raising awareness about the right to bare in public places where it’s already permissible for men to do the same.