Masturbation is self-improvement…
I thought I would add in some info I found and tried. It is called Penis root masturbation. It has been used for premature ejac with success. Only rub and stimulate the lower half of the penis . It did 2 things for me definitely made it longer to to get enough stimulation to cum and changed the sensation area from the head of the penis to the lower portion . I found that it did help improve being able to last longer while having sex . I didn’t go from 5 min of thrusting to 30 but it did add some and helped to be able to control release if you slow down.