There is a lot of information about “suicide-by-cop”, but I cannot find any statistics about the kind of scene depicted. Mostly, the people killed in these interactions have, or act like they have, a weapon in order to provoke a violent response. Do a search for suicide-by-cop statistics and you get lots of interesting results. Cheers.
According to one urologist named Dudley Danoff, from a MEL Magazine article, it is not something that happens. So, while this is just one doctor’s report over a lifetime of patients, this would seem to indicate ejaculation during a prostate exam is exceedingly rare. Hope this helps. Cheers!