Last night my friend Mary masturbated in the church sanctuary where all of us girls were supposed to be sleeping. I think I am the only one who heard the crinkle of her Barbie-brand sleeping bag and the squelch of her fingers, kneading between her legs. Later, after I thought she was finished, she started moaning loudly. I think everyone heard, but when I rolled over to her sleeping bag, she was asleep. I clutched…