I always thought it was because I jerk off too much and wear myself out, but I don't come unless I squeeze the muscles down there. I have to make myself cum or I just go until I go limp ( which gets quicker with my old age). In fact that's my problem, I can barely get hard anymore, I usually stop at about 3/4 of the way and I and don't get fully hard anymore, usually can't even penetrate my wife and we have to do oral.
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