It is so very important what she is doing. It is very important for every penis, for the testicles, for the free glans etc to be really punched every day to make the balls, the free glans and the testicles more resistent. The penis should be fully erected during this procedure.
Could you exactly define the difference? I have thought milking was a lengthy handjob and then when the guy comes the keeps on going till there is no more cum