My belief is that greater blood flow is beneficial for PE. I find that excessive masturbation (5 times or more a day) leads to turtling that day and reduced morning erections on the next. Currently I like to masturbate in the morning, and before I sleep. I sometimes masturbate before I stretch if I find I am having trouble staying flaccid.
I would be interested in knowing if masturbation does affect blood flow, and if it does by how much.
I think something could be achieved by measuring volume at intervals throughout the day, and keeping records of frequency, and length of masturbation. Someone could then do various types of statistical analysis - although probably not me, my mathematics is limited. However, it would be far from conclusive as so much would be missed (night time volume, the volume during the periods in between the measurements) and it would be hard to account for other factors such as diet, exercise, and the number of attractive people that you see in the day.
Alternatively, I suppose we could record volume at intervals throughout the day while not masturbating for a number of days. Then make the same measurements over the same number of days while masturbating and test for a significant difference. This would still have the same limitations as above.
Does anyone have any thoughts on how to easily measure volume? Displacement of water is the best I can come up with. Are flaccid length and flaccid girth directly proportional? If so, measuring flaccid length might be enough.