Two former caretakers for Koko, the famous gorilla who communicates with humans using sign language, say they were continually pressured to show Koko their breasts or face the consequences. Nancy Alperin and Kendra Keller are suing Koko's primary caretaker, Dr. Francine "Penny" Patterson, because she allegedly asked them to "perform bizarre sexual acts with Koko" — namely, taking off their tops — to bond with the five-foot-tall, 280-pound female gorilla. "Patterson would interpret certain hand movements made by Koko as a 'demand' to see exposed human nipples," the suit alleges. "[Patterson] made it known to Keller and Alperin that if...