(As requested) IamA man who was on a male form of birth control as an experimental drug in a clinical trial, AMA!
My short bio: I work at a historical animal facility that also has outpatient centers for human testing. I applied for the male birth control study (it had been tested on about 600 people before me and nobody had been adversely affected). I did the study twice, once for one month and then again a year later for about a week, there is supposed to be a third study at some point that goes on for three months. I was compensated for my efforts. I hope the images constitute enough proof, I never imagined having to prove this.
My Proof: http://imgur.com/a/DoQsx