Your nuts would get to a smaller size and stay there. as for becoming sterial it isnt a joke and can happen, alot of people run hcg with there HRT to keep there testies working, this alone does not keep you from becoming sterile but it can help, hmg is a chemical that stimulates LH and FSH (hormones that tell your nuts to work and produce sperm)
This can be used as treatment if your sperm count is low, i have read studies saying over a two year period it can bring you back to 96% recoverd, but this is new treatment.