I was flying a long B52 mission with a military crew and one member was a woman/girl. It was her first long ride and she couldn't hold it any longer. We had only the "honey Pot" to go to the bathroom in and it was in a box surrounded by a zip curtain. She went to the back of the airlplane and after fiddling with it for 5 minutes she plugged into the interphone system (so she thought) and requested help from the Captain. In a sweet young voice she said "Pilot, I can't seem to get this zipper undone. Pilot, I just can't get low enough to unzip it, can you help me." Unfortunately, she plugged into the radio #1, the center Frequency. After a long, long radio silence on center frequency, Center relunctantly chimed in and said "I don't know what's going on up there, but turn to heading 360."