She's a Man, Baby, a Man!

As a heatwave descends on San Francisco, Phoebe begins to have erotic dreams that end in the killing of her dream lovers. The sisters find out that she is psychically linked, through her powers, to a man-killing sexual predator demon known as a 'succubus' that drains men of their testosterone. When they cast a spell, hoping to find and then vanquish the succubus, it turns Prue into a man.