I've always been a disbeliever in the injecting method, primarily because how does the guy make it cum out? Urine cannot come out during an orgasm and especially ejaculation because the duct from the bladder gets closed. There can be retrograde ejaculation when the semen goes into the bladder, but that's a problem, not a purposeful thing.
so the "actor" is wanking it or whatever and then this massive semen load just keeps cumming and cumming, right? Does the guy make himself pee? Like is the bladder so full of this fake shit that he feels like he has to pee the entire time and is holding it back? Does simply pushing or trying to force it out through the way normal peeing happens towards the end work? Squeezing the PC muscles through clamps, does that make it happen? I cannot believe that the guy is having an orgasm when the fake semen comes out, if that happened he'd pee every time he had an orgasm with ejaculation. It just sounds kind of hard to figure out, how to make the body get it out for a performance on camera.
Well this guy figured it out I guess, I had to google "injecting fake cum into bladder" to find this. He's doing it for sure, looks like a painful method. But is this how the guys do it?
http://xhamster.com/movies/3114633/method_of_injecting_into_the_bladder_of_fake_semen.html