First challenge

A flash of light found three jars, one each at the sisters' feet. They looked like mason jars, each clear and about 12 ounces. They were empty.
"For your first task, you have 24 hours to fill each of those jars with human male semen. We'll allow a little of your saliva too. For each of you who does not complete this task, we will destory one innocent life and publicly humiliate you in ways you can only imagine. You have 24 hours to bring the filled jars back to this spot!"
With a blinding flash of light, the girls found themselves alone with the three empty jars.
"What are we going to do?" asked Prue as she picked up the jar in front of her.
"Do we have a choice?" asked Phoebe picking up her jar.