hi, venicejay;
I’ve thought about modifying P101; you ask a good question because I haven’t spent 20 minutes in the tube in one session in going on a year. I haven’t changed the document though because there are a lot of guys who like long sessions and for them there should be some sort of guide as to how to build up to that.
What you’re doing - reducing pressure frequently then increasing to a full erection again - is probably giving you a terrific vascular workout. By introducing newly oxygenated blood so often you are not only nourishing penile tissue but also giving your vascular system a good flushing.
I know I tend to harp on this but it is something important for all of us to consider. By far we spend the greatest percentage of a 24 hr day in flaccid states. It is probably because of this that we have patterns of 4 to 5 nocturnal erections, each lasting about a half hour. During these events, there is a great deal of oxygenated blood exchange and it is these nocturnal erections that keep us primed so that we can have good sexual ones. You are simply augmenting that process and probably to your long-term benefit.
You may also end up with a very veiny cock but try to see that as an advantage. It’s a good, powerful look and those firm veins are going to provide some lucky person even more stimulation during sex.