I'm not sure about extreme, but I have read the Kama Sutra in some
interesting places. I will leave it at that though, for the sake of the innocent.
Oh, and I do remember doing research on Chinese history at a strip club. It was my roommate's birthday and she wanted to take me to a gentlemen's establishment for her own strange amusement. I think the workers were a little offended that I was ignoring them the whole time.