Maybe it has to deal with the timeframe the cock is under extreme pressure. When you hear priapism its 4, 5 or even 6 hr timeframes of painfully enlarged erection.
Maybe this is why titleist marathon pumping of four hrs gets him gains.
Currently: 9.75bpX6.75eg My Picture Thread
Goal:10.0bpX7.25mseg Building a thicker unit, click by click, pump by pump, jelq by jelq!