The longer you're on, the less likely it is you can have kids. Obviously the same with TRT. Those on TRT usually have sperm counts of 0, and will need HCG if they're trying to have kids (and even that doesn't work for a lot of people).I have heard it both ways, if you never come off you can't have kids anymore. I have also heard you can still have kids because test doesnt kill your sperm you jus don't make your natural test. Anyone know for sure if you don't come off can you still have kids?
To put it unscientifically - your balls shut down, shrink and stop working when testosterone is being introduced from outside of the body.