I've read that porn stars are injecting when viagra stops working but eventually that doesn't work (i.e. injury, etc) and they're rendered impotent. Or maybe it's the combination of injection and herpes and various venereal diseases. 
Actually, I think there isn't that much turnover on the male side. Some of the guys work for decades. They are freaks who can consistently perform on camera.
My old lifting partner has been a male performer for many years now, but I lost contact with him. Otherwise I could have asked what they do. He's a competitive bb too. I saw on a pod he had to downsize recently because he developed heart failure from being on 4 grams for so long.
Crazy hard trainer. Totally insane. I remember when the gym was closed unexpectedly he went into the woods and lifted wood branches. Another time when he was prepping he was out doing cardio walking and got lost, had to call for help haha
