Video (in link below): MRI Sex
New Scientist brings you sex as you’ve never seen it before: the first video of a couple having sex in an MRI scanner (see video). Just released, it was made from a series of images captured during an experiment some years ago. The study aimed to prove that it was possible to image male and female genitals during sex and to help better understand human anatomy.

As should be obvious, the video is sexually explicit.

https://www.newscientist.com/article/dn17662-human-sex-from-the-inside-out/

(CREDIT: Upon looking, I just realized Emp posted this about 10 year back)