I've used the Silisleeves succesfully while pumping. Duros I haven't tested yet while pumping. One could also use
cockrings. And of course, keeping the area clean of long pubic hair does wonders for the suction.
Warm up properly before using the pump. You can do the first set with easy intensity and then progress in force, especially when using the
5x5x3 method.
There are many ways to gain. Certain lines are put out here in MOS but it would be interesting if people would also try things for themselves. Reading along the lines and modifying a routine for yourself.
While many routines are tried and true, experimentation is a big thing.
(With this said, I've used pocket pussies etc., as a
sleeve before ...)