Okay, I may be taking this thread off-topic with this, so if MrJerseyGuy requests it, I'll start another thread.

Something Kalluss said about de-tumescing(sp?) suddenly made me think. (Yes, I somehow made it through my first 44 years without thinking.) Instead of being concerned about premature ejaculation, why don't you just shrug and keep on pumping? At my age (which is approximately yours), if I go soft it takes either hours or an act of Congress to get me up again. BUT, it takes a good five minutes to soften (de-tumesce), and if I maintain the stimulation, it never goes soft. Granted, this is masturbation, not sex, but wouldn't the principal be the same?