I thought the reason they were called steroids is because they shut down natural test production making the user temporarily sterile (although guys still seem to get women pregnant while on) once you stop using your natural test slowly comes back, doing pct and it comes back quickly..any permanent condition would be the result of shutting yourself down for so long by continually using steroids w/o breaks (not cycling) that the condition becomes permanent, like what the Dr said, being on constantly for years is a very bad idea. If your concerned about it at all then HCG is an excellent drug during the cycle, an keep the cycles less then 20 weeks (including PCT) and take a break and run your natural test w/o any drugs for a while before starting up again.