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Dutch researchers recruited several couples (including a pair of street acrobats) to have sex in an MRI. They produced highly detailed pictures of human anatomy during coitus.

"I expose to men the origin of their first, and perhaps second, reason for existing."1 Leonardo da Vinci (1452-1519) wrote these words above his drawing "The Copulation" in about 1493 (fig 1).2 The Renaissance sketch shows a transparent view of the anatomy of sexual intercourse as envisaged by the anatomists of his time. The semen was supposed to come down from the brain through a channel which can be seen in the spine of the man. In the woman the right lactiferous duct is depicted as originating in the right female breast and ending in the genital area. Even a genius like Leonardo da Vinci distorted men's and women's bodies---as seen now---to fit the ideology of his time and to the notions of his colleagues, who he paid tribute to.

Source: BMJ.com

Sounds like a brainy excuse to watch some people doing it. A HotMovies account is cheaper and no one makes a mess inside your MRI tube.