I pump and jelq about every other day. it's mostly temporary gains, good for a few hours. I am over 6" in girth before pumping, and after it is super massive. my wife has seen my "plump" state and sometimes leads to immediate sex. I sometimes will do this before I go out for an evening, resulting in a nice pants bulge in my 501's "geez, you are packing" a lady told me one nite. over time, I have noticed my entire shaft is thicker, and I hang longer in a flaccid state. if it doesn't help, it's not hurting me either. you do have to be careful not to injury yourself.