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Why to damage the stick with dry Pumping ,
I use little K-Y GEL on the hole of pump rubber so when it start sucking and get erected in side the pump without any pain to get or feel . So I think it’s Bad idea of dry pumping when you pump with
Rubber or your pump is less then 2 Inches in Width.
Good point Gentleman. Another point is if you dry pump and you do not have any lube on your penis it will stop you from getting bigger in the tube once you fill the tube girth wise. Another point is that it aids in getting a better seal so you do not have to keep pumping to keep a good vacuum going.