I would just like to add that a DRY jack off 9 times out of 10 is NOT stimulating. Some ladies just don't seem to know that a lubed hand works WAAAAYY better wonders than a dry one. That and, a stroke is much better than a YANK/TUG. Sometimes it's simply a finesse issue. If no finesse is used, many times it sends the wrong signals to the guy's brain, and therefore no stimulation is happening.
I know most of you ladies know this stuff, but, some DON'T know it. If you're a TUG YANKER, stop and start being a FINESSER/STROKER. We guys will greatly appreciate it.