The problem with this sort of study is that it is . . .
a) very difficult to get a consistent measurement (ie. does "maximum manual traction" mean something different when measured by a technician wearing black leather and studs?) and
b) difficult to control for normal changes with age in, say, the thickness of the prepubic fat pad. Were the schlongs getting longer or were the pubes getting bonier?
My take away from the study came from this bit:
the study said...
Erectile function was a predictor for early return of penile length
This suggests that until there is some progress on the ED front it's probably best to continue with my new hobby.