Interesting question, why. 10, or 15% is not that small of an increase. Say your glans is 5” around, your increase would be .5” and .75” respectively.
Okay so first of all I don’t think my glans is 5” around.. It’s difinately smaller than my shaft.. An increase in circumference of 0.75” wouldn’t be bad, but what about length gains?
You think an increase of let’s say 0.5” in glans length is possible too??
Combined with the girth increase the difference would be much more visible; in that case I’d consider having it done.