Both. as every comment suggests. I clamp countless hrs. The only time I'm not clamped is when I'm in the tube with the pump - which I tube pack damn near instant. But the Girth is all great! After an hr of pumping - I clamp again to hold the initial pump..the results over time are ridiculous! condoms only go 1/2 way up my shaft...if clamping and pumping proves a point...find your technique brother and go in deep like none other and you'll discover how much more you can be...
 
I like to clamp because I don't always have the privacy for the [words=https://officialhydromaxpump.com/?uid=6&oid=2&affid=98 ]Bathmate[/words]
 
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